How to delete elements with specified key names in an array in php

How to delete elements with specified key names in an array in PHP: 1. Use the unset() function, the syntax "unset($array[key name]);"; 2. Use the array_diff_key function, the syntax "array_diff_key($ array,[key name=> ""...])".

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

1. Use the unset function key to delete One element, and keep the original index unchanged

The example is as follows:

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
unset($array[1]);
           //↑ 你想删除的key
print_r($array);
?>

Output:

Array ( [0] => a [2] => c )

Using unset does not change the original index of the array. If you want to rearrange the index (so that the index starts from 0 and is continuous), you can use the array_values ​​function.

2. Use the array_diff_key function to delete multiple elements by key and keep the index

The example is as follows:

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
$array = array_diff_key($array, [0 => "", "2" => ""]);
				        //↑      ↑ 你想删除的数组键keys	
print_r($array);
?>

Output:

Array ( [1] => b )

Similar to unset, array_diff_key will also maintain the index.

Recommended learning: "PHP Video Tutorial"

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