How to delete multiple elements from an array in php

php method to delete multiple elements of an array: 1. Use the array_diff() function to delete multiple elements of the array; 2. Use the array_diff_key() function to delete multiple elements of the array.

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

How to delete multiple elements of an array in php?

Delete multiple elements in the array

If you want to delete multiple elements in the array, you cannot use the unset() or array_splice() function. , you need to use the array_diff() or array_diff_key() method, which requires knowing the key or value to be deleted.

array_diff() method

If you know the array element you want to delete, you can use array_diff().

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
$array = array_diff($array, ["a", "c"]);
                          //└────────┘→你要删除的元素
print_r($array );
?>

The output result is:

Array
(
    [1] => b
)

array_diff_key() method

If you know the key of the array element to be deleted , you can use array_diff_key(). You need to enter the key to be deleted in the key value position of the second parameter of the function. The value is not required and can be optional.

<?php
$array = array(0 => "a", 1 => "b", 2 => "c");
$array = array_diff_key($array, [0 => "xy", "2" => "xy"]);
                               //↑           ↑ 你要删除的数组键
print_r($array);
?>
输出结果为：
Array (
    [1] => b
)

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