Hướng dẫn dùng js implode trong PHP

Mảng là một trong những khái niệm quan trọng trong việc lưu trữ và xử lý dữ liệu. Biết vận dụng các kiến thức về mảng đặc biệt là nắm rõ cơ chế hoạt động của các hàm xử lý mảng sẽ giúp bạn xử lý dữ liệu phức tạp một cách dễ ràng và nhanh chóng hơn rất nhiều. Nhận định này luôn đúng ở hầu hết các ngôn ngữ hiện nay trong đó có Javascript.

Mỗi ngôn ngữ khác nhau sẽ có những cách đặt tên khác nhau cho các hàm xử lý mảng của mình. Tuy nhiên, về bản chất là giống nhau.

Bài viết này mình sẽ cũng các bạn tìm hiểu về những hàm xử lý mảng quan trọng trong Javascript, từ đó giúp các bạn ứng dụng vào công việc hàng ngày của mình.

1. pop()

Phương thức này cho phép xóa phần tử cuối cùng trong mảng và kết quả trả về là phần tử vừa được xóa. Các bạn có thể xem chi tiết ví dụ dưới đây để hiểu hơn về pop trong Javascript

Sau khi xóa xong mảng

["test", "Bananas", "Mangos", "Apples", "Cherries"]

2. push()

Phương thức push() cho phép thêm mới 1 phần tử vào vị trí cuối cùng của mảng. Giá trị thêm vào có thể là chuỗi, số, array hoặc object. Sau khi push thành công nó sẽ trả về tổng số phần tử của mảng.

Dữ liệu của mảng sau khi thêm mới phần tử

["Bananas", "Mangos", "Apples", "Cherries", "Grapes"]

3. unshift()

Phương thức

["test", "Bananas", "Mangos", "Apples", "Cherries"]

Dữ liệu của mảng sau khi thêm mới phần tử

["test", "Bananas", "Mangos", "Apples", "Cherries"]

4. shift()

Phương thức

["test", "Bananas", "Mangos", "Apples", "Cherries"]

["test", "Bananas", "Mangos", "Apples", "Cherries"]

["test", "Bananas", "Mangos", "Apples", "Cherries"]

["test", "Bananas", "Mangos", "Apples", "Cherries"]

let fruits = ["Mangos", "Bananas", "Mangos", "Apples", "Cherries", "Pineapples"]
fruits.shift()

Dữ liệu của mảng sau khi xóa

["Bananas", "Mangos", "Apples", "Cherries"]

5. slice()

Phương thức này cho phép tách các phần từ trong mảng thành một mảng mới. Các phần tử được tách từ vị trí bắt đầu và kết thúc mà mình truyền vào. Trong mảng thứ tự sẽ được đánh từ 0 đến N (Cái này gọi là index của mảng)

Chúng ta cùng tìm hiểu ví dụ sau để hiểu hơn về phương thức này

Nhìn vào kết quả trên các bạn thấy phần tử được tách nằm ở ví trí số 2 đến 4 tương đương với 2 giá trị là Mangos và Apples

6. splice()

Phương thức này tương tự phương thức thức

["test", "Bananas", "Mangos", "Apples", "Cherries"]

* Xóa và thay thế phần tử đã xóa

let fruits = ["Mangos", "Bananas", "Mangos", "Apples", "Cherries"]
fruits.splice(2,1,"Oranges")

Kết quả: ["Mangos", "Bananas", "Oranges", "Apples", "Cherries"]

* Xóa luôn

let fruits = ["Mangos", "Bananas", "Mangos", "Apples", "Cherries"]
fruits.splice(2,1)

Kết quả: ["Mangos", "Bananas", "Apples", "Cherries"]

7. reverse()

Phương thức này cho phép sắp xếp thứ tự các phần tử của mảng bằng cách đảo ngược vị trí hiện tại

let fruits = ["Mangos", "Bananas", "Mangos", "Apples", "Cherries"]
fruits.reverse()
Kết quả:
["Cherries", "Apples", "Mangos", "Bananas", "Mangos"]

8. sort()

Phương thức này cho phép bạn sắp xếp các giá trị trong mảng theo thứ tự alphabet

let fruits = ["Mangos", "Bananas", "Mangos", "Apples", "Cherries"]
fruits.sort()

Kết quả:
["Apples", "Bananas", "Cherries", "Mangos", "Mangos"]

9. concat()

Phương thức

["test", "Bananas", "Mangos", "Apples", "Cherries"]

let a = ['HTML', 'CSS']
let b = ['Javascript']
let c = ['PHP']
a.concat(b, c)

Kết quả:
["HTML", "CSS", "Javascript", "PHP"]

10. join()

Nếu bạn nào đã làm việc với PHP sẽ thấy concept của phương thức này rất giống với hàm

["test", "Bananas", "Mangos", "Apples", "Cherries"]

Để hiểu hơn chúng ta cùng tìm hiểu ví dụ sau.

let arr = ["HTML", "CSS", "Javascript", "PHP"]
arr.join('-')
Kết quả:
"HTML-CSS-Javascript-PHP"

Đây là 10 phương thức xử lý mảng trong Javascript được sử dụng thường xuyên khi các bạn xử lý dữ liệu. Tất nhiên là Javascript còn nhiều phương thức khác nữa, tuy nhiên đây là những phương thức mà chúng ta hay sử dụng nhất. Sau này có hàm nào hay mình sẽ update tiếp vào bài viết này để các bạn theo dõi cho tiện.

Bài viết dưới đây sẽ tổng hợp một số hàm phổ biến có chức năng tương tự nhau giữa hai ngôn ngữ lập trình: PHP và JavaScript (JS).

Việc nắm rõ các hàm built-in của cả hai ngôn ngữ sẽ giúp việc coding trở nên linh hoạt hơn.

Đồng thời, việc phân biệt giữa cách sử dụng những hàm này sẽ tránh những nhầm lẫn không đáng có.

Các hàm thao tác với chuỗi

Tách chuỗi thành một mảng

Nếu như trong PHP, hàm đầu tiên có thể nghĩ tới là

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$pizza  = "piece1 piece2 piece3 piece4 piece5 piece6";
$pieces = explode(" ", $pizza);
echo $pieces[0]; // piece1
echo $pieces[1]; // piece2

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Khớp một biểu thức chính quy

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

// The "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match("/php/i", "PHP is the web scripting language of choice.")) {
    echo "A match was found.";
} else {
    echo "A match was not found.";
}

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

const paragraph = 'The quick brown fox jumps over the lazy dog. It barked.';
const regex = /[A-Z]/g;
const found = paragraph.match(regex);

console.log(found);
// expected output: Array ["T", "I"]

Có thể thấy, dù thực hiện cùng một chức năng, nhưng kết quả trả về giữa hai hàm trên là khác nhau.

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

Tương tự, cũng sẽ có cặp hàm tương ứng

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

Lấp đầy chuỗi (pad a string) theo độ dài cho trước

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

Thay vì có một đối số

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

Tìm vị trí xuất hiện đầu tiên của chuỗi cần tìm trong chuỗi cho trước

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

Một lưu ý tiếp theo về sự khác nhau giữa dữ liệu trả về của hai hàm trên.

Khi không có chuỗi cần tìm:

Hàm

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

Hàm

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

Một số cặp hàm xử lý chuỗi khác

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

Các hàm thao tác với mảng

Đếm số lượng phần tử của mảng

Một trong những bài toàn thường gặp nhất ở bất kỳ ngôn ngữ lập trình nào.

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

Trong trường hợp của JS, có thể đếm số lượng phần tử mảng dựa vào thuộc tính

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

Nối các phần tử của mảng thành một chuỗi

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Hàm

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

Gộp hai mảng vào nhau

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Hàm

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

Đối với mảng có key dạng chuỗi, phần tử của mảng bị trùng key sẽ bị ghi đè.

Xác định giá trị cho trước có tồn tại trong mảng

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Mặc định cả hai hàm trên đều phân biệt hoa thường khi tìm kiếm.

Tìm vị trí xuất hiện đầu tiên của phần tử cần tìm trong chuỗi cho trước

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Chú ý:

Hàm

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

Hàm

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

Hàm

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

Cả hai hàm trên đều phân biệt hoa thường.

Sắp xếp mảng theo hàm tự định nghĩa

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Một số cặp hàm xử lý mảng khác

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Tổng hợp chung các hàm đã điểm qua

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input,  6, "___");               // produces "Alien_"
echo str_pad($input,  3, "*");                 // produces "Alien"

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

const str1 = '5';

console.log(str1.padStart(2, '0'));
// expected output: "05"

const fullNumber = '2034399002125581';
const last4Digits = fullNumber.slice(-4);
const maskedNumber = last4Digits.padStart(fullNumber.length, '*');

console.log(maskedNumber);
// expected output: "************5581"

const str1 = 'Breaded Mushrooms';

console.log(str1.padEnd(25, '.'));
// expected output: "Breaded Mushrooms........"

const str2 = '200';

console.log(str2.padEnd(5));
// expected output: "200  "

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const paragraph = 'The quick brown fox jumps over the lazy dog. If the dog barked, was it really lazy?';

const searchTerm = 'dog';
const indexOfFirst = paragraph.indexOf(searchTerm);

console.log('The index of the first "' + searchTerm + '" from the beginning is ' + indexOfFirst);
// expected output: "The index of the first "dog" from the beginning is 40"

console.log('The index of the 2nd "' + searchTerm + '" is ' + paragraph.indexOf(searchTerm, (indexOfFirst + 1)));
// expected output: "The index of the 2nd "dog" is 52"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$a[0] = 1;
$a[1] = 3;
$a[2] = 5;
var_dump(count($a));  // 3

$b[0]  = 7;
$b[5]  = 9;
var_dump(count($b));  // 2

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

// Note our use of ===.  Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
    echo "The string '$findme' was not found in the string '$mystring'";
} else {
    echo "The string '$findme' was found in the string '$mystring'";
    echo " and exists at position $pos";
}

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

const clothing = ['shoes', 'shirts', 'socks', 'sweaters'];

console.log(clothing.length);
// expected output: 4

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Như một lẽ dĩ nhiên, không phải lúc nào cũng có cặp hàm tương ứng trong hai ngôn ngữ lập trình. Một số hàm có tồn tại ở PHP, nhưng lại không có ở JS và ngược lại. Chính vì lẽ đó, một vài thư viện ra đời để góp phần giải quyết vấn đề này.

Thư viện JS có thể kể đến trong việc hỗ trợ tích hợp các hàm của PHP:

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

Ở chiều ngược lại, gần như các hàm của JS đều có thể được hỗ trợ bởi PHP. Với framework phổ biến nhất hiện nay là Laravel, có thể dễ dàng tìm thấy các hàm mở rộng thông qua hai class

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"

const str = 'The quick brown fox jumps over the lazy dog.';

const words = str.split(' ');
console.log(words[3]);
// expected output: "fox"