如何從 PHP 陣列中刪除特定元素？

Removing Specific Elements from an Array in PHP

Managing arrays in PHP is essential for organizing and manipulating data. One common task is removing specific elements from an array. Suppose you have an array containing items such as fruits, and a user chooses to remove a particular fruit, say "strawberry," from the list.

Solution:

To remove an element from an array when you know its value, you can utilize the array_search and unset functions:

<?php
$array = ['apple', 'orange', 'strawberry', 'blueberry', 'kiwi'];

if (($key = array_search('strawberry', $array)) !== false) {
    unset($array[$key]);
}
?>

Explanation:

• **array_search('strawberry', $array)**: This function searches for the value 'strawberry' in the $array and returns its key index if found.
• unset($array[$key]): If the key is not false, unset removes the element from the array at that key index, effectively removing 'strawberry' from the list.

Multiple Occurrences:

If there are multiple occurrences of the same element, you can use array_keys to retrieve the keys of all instances:

<?php
$array = ['apple', 'strawberry', 'orange', 'strawberry', 'kiwi'];

foreach (array_keys($array, 'strawberry') as $key) {
    unset($array[$key]);
}
?>

In this example, all occurrences of 'strawberry' will be removed from the array.

Additional Resources:

• [array_search](https://www.php.net/manual/en/function.array-search.php)
• [unset](https://www.php.net/manual/en/function.unset.php)
• [array_keys](https://www.php.net/manual/en/function.array-keys.php)

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