How to remove specified elements from an array in php

PHP is a popular server-side programming language commonly used to develop web applications. In the process of web development, we often need to deal with arrays. Sometimes we need to remove specific elements from an array. This article will introduce how to use PHP to remove specified elements from an array.

1. Use the unset function

The unset function in PHP can be used to delete an element from an array. When using the unset function, you need to specify the index of the element to be deleted.

For example, suppose there is the following array:

$fruits = array("apple", "banana", "cherry", "date");

If you want to delete the element "banana", you can use the unset function:

unset($fruits[1]);

The above code will delete it from the $fruits array The element with subscript 1 is "banana".

2. Use array_search and unset functions

If we don’t know the subscript of the element to be deleted, we can first use the array_search function to find the position of the element in the array, and then use the unset function Delete the element.

For example, suppose there is the following array:

$fruits = array("apple", "banana", "cherry", "date");

To delete the element "banana", you can use the array_search function to find the position of the element in the array, and use the unset function to delete it:

$key = array_search("banana", $fruits);
unset($fruits[$key]);

In the above code, the $key variable saves the subscript of the "banana" element in the array, and then uses the unset function to delete the element.

3. Use the array_diff function

If you want to delete multiple specified elements in the array, you can use the array_diff function. The array_diff function accepts two or more arrays as arguments and returns a new array containing the elements in the first array that are not contained in the other arrays.

For example, suppose there is the following array:

$fruits = array("apple", "banana", "cherry", "date");
$to_remove = array("banana", "date");

To delete the elements contained in the $to_remove array, you can use the array_diff function:

$result = array_diff($fruits, $to_remove);

In the above code, the $result variable is saved The result array after deleting the elements contained in the $to_remove array from the $fruits array is:

Array
(
    [0] => apple
    [1] => cherry
)

By using the above method, you can easily delete the specified element from the PHP array.

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