How to delete an element from php array

In PHP, an array is a very commonly used data structure that allows us to store data in a variable in the form of key-value pairs. Arrays are very convenient and can be manipulated in different ways. This article will focus on how to delete elements from an array in PHP.

In PHP, we can use the unset function to delete elements in an array. The syntax of the unset function is as follows:

unset(array $array [, mixed $...]): delete one or more array elements

Among them, the $array parameter is an array, $ ... is an optional parameter that indicates that multiple array elements can be deleted in the same line, separated by commas.

Let’s look at a specific example:

// 定义数组
$arr = array("apple","banana","orange","grape");

// 删除其中一个元素
unset($arr[1]);

// 打印数组
print_r($arr);

In this example, we define an array $arr, which contains four elements: apple, banana, orange, grape. Then, we use the unset function to delete the second element banana in the array. Finally, we use the print_r function to output the deleted array. The output result is as follows:

Array
(
    [0] => apple
    [2] => orange
    [3] => grape
)

You can see that the banana element has been successfully deleted, and only three elements are left in the array.

In addition to using the unset function, we can also use the array_splice function to delete elements in the PHP array. The syntax of the array_splice function is as follows:

array_splice(array &$input, int $offset [, int $length = count($input), $replacement = array()]): Delete one or more items in the array elements, and insert new elements into the original array (optional)

Among them, the $input parameter is an array, the $offset parameter indicates the starting position of the deleted array, and the $length parameter indicates the number of elements to be deleted. The default value is the length of the array, and the $replacement parameter indicates the new element to be inserted into the array. If there is none, no element is inserted.

Let’s look at an example below:

// 定义数组
$arr = array("apple","banana","orange","grape");

// 删除其中一个元素
array_splice($arr, 1, 1);

// 打印数组
print_r($arr);

In this example, we also define an array $arr, which contains four elements (apple, banana, orange, grape). We then used the array_splice function to remove the second element banana in the array (starting at 1, removing one element). Finally, we use the print_r function to output the deleted array. The output result is as follows:

Array
(
    [0] => apple
    [1] => orange
    [2] => grape
)

You can see that the banana element has been successfully deleted, and only three elements are left in the array.

Summary

In PHP, we can use the unset function and array_splice function to delete elements in an array. No matter which method we use, the end result is the same. The unset function only deletes one element in the array, while the array_splice function can delete multiple elements and insert new elements into the original array. In actual development, we can choose different functions to operate arrays according to actual needs.

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