Php remove element from array in foreach

Question

Be careful with the main answer.

Nội dung chính Show

1. Using array_search() function
2. Using foreach construct
How do I remove an object from an array in foreach?
How to remove 1 element from array in PHP?
Can we remove an element by using foreach loop?
How do you remove an object from an array?

with

[['id'=>1,'cat'=>'vip']
,['id'=>2,'cat'=>'vip']
,['id'=>3,'cat'=>'normal']

and calling the function

foreach($array as $elementKey => $element) {
    foreach($element as $valueKey => $value) {
        if($valueKey == 'cat' && $value == 'vip'){
            //delete this particular object from the $array
            unset($array[$elementKey]);
        } 
    }
}

it returns

[2=>['id'=>3,'cat'=>'normal']

instead of

[0=>['id'=>3,'cat'=>'normal']

It is because unset does not re-index the array.

It reindexes. (if we need it)

$result=[];
foreach($array as $elementKey => $element) {
    foreach($element as $valueKey => $value) {
        $found=false;
        if($valueKey === 'cat' && $value === 'vip'){
            $found=true;
            $break;
        } 
        if(!$found) {
           $result[]=$element;
        }
    }
}

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Use unset() function to remove array elements in a foreach loop. The unset() function is an inbuilt function in PHP which is used to unset a specified variable. The behavior of this function depends on different things. If the function is called from inside of any user defined function then it unsets the value associated with the variables inside it, leaving the value which is initialized outside it.

Syntax:

unset( $variable )

Return Value: This function does not returns any value.

Below examples use unset() function to remove an array element in foreach loop.

Example 1:

<?php

$Array = array(

"GeeksForGeeks_1",

"GeeksForGeeks_2",

"GeeksForGeeks_3"

);

print_r($Array);

foreach($Array as $k => $val) {

if($val == "GeeksForGeeks_3") {

unset($Array[$k]);

}

print_r($Array);

?>

Output:

Array
(
    [0] => GeeksForGeeks_1
    [1] => GeeksForGeeks_2
    [2] => GeeksForGeeks_3
)
Array
(
    [0] => GeeksForGeeks_1
    [1] => GeeksForGeeks_2
)

Example 2:

<?php

$Array = array(

array(0 => 1),

array(4 => 10),

array(6 => 100)

);

print_r($Array);

foreach($Array as $k => $val) {

if(key($val) > 5) {

unset($Array[$k]);

}

print_r($Array);

?>

Output:

Array
(
    [0] => Array
        (
            [0] => 1
        )

    [1] => Array
        (
            [4] => 10
        )

    [2] => Array
        (
            [6] => 100
        )

)
Array
(
    [0] => Array
        (
            [0] => 1
        )

    [1] => Array
        (
            [4] => 10
        )

)

In this post, we will see how to remove a specific element from an array by its value in PHP.

1. Using array_search() function

If the array contains only a single element with the specified value, you can use the array_search() function with unset() function to remove it from an array. The array_search() function searches the array for a given value and returns the first corresponding key if present in the array, false otherwise. If the value is found in the array, you can remove it using the unset() function.

<?php

$arr=array("a"=>"red","b"=>"blue", "c"=>"green");

$val ="blue";

$key= array_search($val,$arr,true);

if($key!==false){

unset($arr[$key]);

}

echojson_encode($arr);

/*

Output: {"a":"red","c":"green"}

*/

?>

For the plain arrays, the code remains similar:

<?php

$arr=[1, 2,3,4,5];

$val=3;

// To perform a strict type comparison, pass the third parameter as true

$key=array_search($val,$arr,true);

if($key!== false){

unset($arr[$key]);

}

echojson_encode($arr);

/*

Output: {"0":1,"1":2,"3":4,"4":5}

*/

?>

Note that the resulting array has holes since the numerical keys in the array are preserved. You can replace the unset() call with the array_splice() function, which removes a portion of the array and doesn’t preserve numerical keys.

<?php

$arr=[1, 2,3,4,5];

$val=3;

$key= array_search($val,$arr,true);

if($key!==false){

array_splice($arr,$key,1);

}

echojson_encode($arr);

/*

Output: [1,2,4,5]

*/

?>

2. Using foreach construct

If your array can contain multiple elements with the specified value, you can use a simple foreach loop to iterate over the array, and unset all matching values.

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<?php

$arr=array("a"=>"red","b"=>"blue", "c"=>"green","d"=> "blue");

$val="blue";

foreach($arras$key=> $value){

if($value ==$val){

unset($arr[$key]);

}

echojson_encode($arr);

/*

Output: {"a":"red","c":"green"}

*/

?>

Note that in each iteration of the loop, the value of the current element is compared with the given value, and it unsets the matching items. The code can be shortened using the array_keys() function:

<?php

$arr=array("a"=>"red","b"=>"blue", "c"=>"green","d"=> "blue");

$val="blue";

foreach(array_keys($arr,$val)as$key){

unset($arr[$key]);

}

echojson_encode($arr);

/*

Output: {"a":"red","c":"green"}

*/

?>

Here’s an example using plain arrays:

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<?php

$arr=[1, 2,3,4,3, 5];

$val=3;

foreach($arras$key=> $value){

if($value ==$val){

//unset($arr[$key]);

array_splice($arr,$key,1);

}

echojson_encode($arr);

/*

Output: {"0":1,"1":2,"3":4,"5":5}

*/

?>

That’s all about removing a specific element from an array in PHP.

Related Posts:

Filter a value from an array in PHP

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How do I remove an object from an array in foreach?

Use unset() function to remove array elements in a foreach loop. The unset() function is an inbuilt function in PHP which is used to unset a specified variable.

How to remove 1 element from array in PHP?

In order to remove an element from an array, we can use unset() function which removes the element from an array and then use array_values() function which indexes the array numerically automatically. Function Used: unset(): This function unsets a given variable.

Can we remove an element by using foreach loop?

The program needs access to the iterator in order to remove the current element. The for-each loop hides the iterator, so you cannot call remove . Therefore, the for-each loop is not usable for filtering.