How to delete array elements in php

A variety of methods can be used to delete array elements in PHP, including: using the unset() function to permanently delete elements at a specified key or index; using the array_splice() function to delete a certain number of elements starting from a specified offset; Use the array_diff() function to create a new array containing the difference between two or more arrays and remove elements that appear in the second array; use the array_filter() function to create a new array containing elements that pass the specified callback function, removing elements that do not appear in the second array. elements that satisfy the condition.

Deleting Array Elements in PHP

PHP provides various methods to delete elements from an array.

1. unset() function

Use the unset() function to permanently delete the element of the specified key or index:

$array = ['foo' => 'bar', 'baz' => 'qux'];
unset($array['foo']);

2. array_splice() function

array_splice() The function can delete a certain number of elements, starting from the specified offset:

$array = ['foo', 'bar', 'baz', 'qux'];
array_splice($array, 1, 2); // 从索引为 1 开始删除 2 个元素

3. array_diff() function

array_diff() function can create a new array containing the difference between two or more arrays, and delete elements that appear in the second array:

$array1 = ['foo', 'bar', 'baz'];
$array2 = ['bar', 'qux'];
$result = array_diff($array1, $array2); // ['foo', 'baz']

4. array_filter() function

array_filter() function can create a A new array containing elements by specifying a callback function. Elements that do not meet the conditions can be deleted:

$array = ['foo', 'bar', 'baz', null];
$result = array_filter($array, function ($value) {
    return $value !== null;
}); // ['foo', 'bar', 'baz']

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