Hướng dẫn implode object php

(PHP 4, PHP 5, PHP 7, PHP 8)

implode — Join array elements with a string

Description

implode(string $separator, array $array): string

Alternative signature (not supported with named arguments):

implode(array $array): string

Legacy signature (deprecated as of PHP 7.4.0, removed as of PHP 8.0.0):

implode(array $array, string $separator): string

Parameters

Optional. Defaults to an empty string.

The array of strings to implode.

Return Values

Returns a string containing a string representation of all the array elements in the same order, with the separator string between each element.

Changelog

Examples

Example #1 implode() example

<?php

$array

Notes

Note: This function is binary-safe.

See Also

• explode() - Split a string by a string
• preg_split() - Split string by a regular expression
• http_build_query() - Generate URL-encoded query string

houston_roadrunner at yahoo dot com ¶

13 years ago

it should be noted that an array with one or no elements works fine. for example:

<?php
    $a1 = array("1","2","3");
    $a2 = array("a");
    $a3 = array();

        echo

biziclop ¶

1 year ago

Sometimes it's necessary to add a string not just between the items, but before or after too, and proper handling of zero items is also needed.
In this case, simply prepending/appending the separator next to implode() is not enough, so I made this little helper function.

<?phpfunction wrap_implode( $array, $before = '', $after = '', $separator = '' ){
  if( ! $array )  return '';
  return $before . implode("{$after}{$separator}{$before}", $array ) . $after;
}

echo

ASchmidt at Anamera dot net ¶

3 years ago

It's not obvious from the samples, if/how associative arrays are handled. The "implode" function acts on the array "values", disregarding any keys:

<?php
declare(strict_types=1);$a = array( 'one','two','three' );
$b = array( '1st' => 'four', 'five', '3rd' => 'six' );

echo

omar dot ajoue at kekanto dot com ¶

9 years ago

Can also be used for building tags or complex lists, like the following:

<?php

$elements

Honk der Hase ¶

2 years ago

If you want to implode an array as key-value pairs, this method comes in handy.
The third parameter is the symbol to be used between key and value.

<?php
function mapped_implode($glue, $array, $symbol = '=') {
    return implode($glue, array_map(
            function($k, $v) use($symbol) {
                return $k . $symbol . $v;
            },
            array_keys($array),
            array_values($array)
            )
        );
}$arr = [
    'x'=> 5,
    'y'=> 7,
    'z'=> 99,
    'hello' => 'World',
    7 => 'Foo',
];

echo

Felix Rauch ¶

5 years ago

It might be worthwhile noting that the array supplied to implode() can contain objects, provided the objects implement the __toString() method.

Example:
<?phpclass Foo
{
    protected $title;

    public function

alexey dot klimko at gmail dot com ¶

11 years ago

If you want to implode an array of booleans, you will get a strange result:
<?php
var_dump(implode('',array(true, true, false, false, true)));
?>

Output:
string(3) "111"

TRUE became "1", FALSE became nothing.

Anonymous ¶

9 years ago

It may be worth noting that if you accidentally call implode on a string rather than an array, you do NOT get your string back, you get NULL:
<?php
var_dump(implode(':', 'xxxxx'));
?>
returns
NULL

This threw me for a little while.

masterandujar ¶

10 years ago

Even handier if you use the following:

<?php
$id_nums = array(1,6,12,18,24); $id_nums = implode(", ", $id_nums); $sqlquery = "Select name,email,phone from usertable where user_id IN ($id_nums)"; // $sqlquery becomes "Select name,email,phone from usertable where user_id IN (1,6,12,18,24)"
?>

Be sure to escape/sanitize/use prepared statements if you get the ids from users.

Anonymous ¶

7 years ago

null values are imploded too. You can use array_filter() to sort out null values.

<?php
$ar = array("hello", null, "world");
print(implode(',', $ar)); // hello,,world
print(implode(',', array_filter($ar, function($v){ return $v !== null; }))); // hello,world
?>

Rafael Pereira ¶

2 years ago

If you want to use a key inside array:

Example:
$arr=array(
array("id" => 1,"name" => "Test1"),
array("id" => 2,"name" => "Test2"),
);

echo implode_key(",",$arr, "name");
OUTPUT: Test1, Test2

function implode_key($glue, $arr, $key){
    $arr2=array();
    foreach($arr as $f){
        if(!isset($f[$key])) continue;
        $arr2[]=$f[$key];
    }
    return implode($glue, $arr2);
}

admin at lanlink dot net dot au ¶

4 years ago

It is possible for an array to have numeric values, as well as string values. Implode will convert all numeric array elements to strings.

<?php
$test=implode(["one",2,3,"four",5.67]);
echo $test;
//outputs: "one23four5.67"
?>

info at ensostudio dot ru ¶

2 years ago

<?php
* Join pieces with a string recursively.
*
* @param mixed $glue String between pairs(glue) or an array pair's glue and key/value glue or $pieces.
* @param iterable $pieces Pieces to implode (optional).
* @return string Joined string
*/
function double_implode($glue, iterable $pieces = null): string
{
    $glue2 = null;
    if ($pieces === null) {
        $pieces = $glue;
        $glue = '';
    } elseif (is_array($glue)) {
        list($glue, $glue2) = $glue;
    }

        $result = [];
    foreach ($pieces as $key => $value) {
        $result[] = $glue2 === null ? $value : $key . $glue2 . $value;
    }
    return implode($glue, $result);
}
?>
Examples:
<?php
$array = ['

info AT sinistercircuits DOT com ¶

9 months ago

There is no mention of behavior on a empty array, so I tried it and here's the result:

<?php
$ar = array();
$result = implode(',', $ar);  // Comma arbitrarily applied as the separator
$is_result_empty = empty($result);
?>

$result:
$is_result_empty: 1

In other words, an empty string is the result.