How to remove specified elements from an array in php

php method to remove specified elements from an array: 1. Use array_splice() function, syntax "array_splice(array,start,length,array)"; 2. Use unset() function, syntax "unset (var) ".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php removes the array specification Element

Method one:

<?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 two:

<?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 there is a difference between using array_splice() to delete specific values ​​and using unset to delete specific 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 learning: "PHP Video Tutorial"

The above is the detailed content of How to remove specified elements from an array in php. For more information, please follow other related articles on the PHP Chinese website!