How to delete specified elements in php

php method to delete specified elements: 1. Use "array_splice()" to delete the specified element, that is, a specific value, and the index value of the array changes; 2. Use the "unset" function to delete a specific value, but the array's index value changes. The index value has not changed.

php method to delete specified elements

Method 1:

<?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:

<?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 in values.

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

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

Recommended: "PHP Tutorial"

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