How to delete specified elements in an array in php?

php method to delete specified elements in an array: 1. Use the [array_splice()] function to delete, the code is [$key = array_search(3, $arr1)]; 2. Use the [unset()] function Delete, the code is [unset($arr2[$key])].

php method to delete specified elements in the array:

Method 1, use array_splice() to delete ：

The code is as follows:

<?php
$arr1 = array(1,3, 5,7,8);
$key = array_search(3, $arr1);
if ($key !== false)
    array_splice($arr1, $key, 1);
var_dump($arr1);
?>

Output:

array(4) { [0]=> int(1) [1]=> int(5) [2]=> int(7) [3]=> int(8) }

Method 2, use the unset() function to delete:

The code is as follows:

<?php
$arr2 = array(1,3, 5,7,8);
foreach ($arr2 as $key=>$value)
{
    if ($value === 3)
        unset($arr2[$key]);
}
var_dump($arr2);
?>

Output:

array(4) { [0]=> int(1) [2]=> int(5) [3]=> int(7) [4]=> int(8) }

Summary:

You can see that using array_splice() to delete specific values ​​and using unset to delete specific values There is a difference.

• array_splice()If the function is deleted, the index value of the array will also change.

• unset()If the function is deleted, the index value of the array will not change.

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