How to delete the entire element in php

php method to delete the entire element: 1. Use the "array_diff()" function to delete the entire array element; 2. Use the "array_diff_key()" function to delete the entire element.

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How to delete the entire element 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 Yes, you need to use the array_diff() or array_diff_key() method. To use this method, you need to know 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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