How to delete an element in an array in php

PHP is a very popular open source language used for web development and server-side programming. Since PHP itself is in the form of an ordered array, when using PHP arrays, you can achieve data organization by deleting elements. This article will show you how to delete an element from an array via PHP.

In PHP, you can use the unset() function to delete an element from an array. The unset() function requires an array and the key name of the element to be deleted. If the key exists in the array, the unset() function will remove the element. The following is a simple example:

$fruits = array('apple', 'banana', 'cherry', 'dates');

// 删除数组中的 'banana' 元素
unset($fruits[1]);

// 输出修改后的数组
print_r($fruits);

In the above code, we create an array named $fruits, and then use the unset() function to delete the element with key name 1, which is the element in the array. 'banana' element. Finally, we output the modified $fruits array using the print_r() function.

In addition to using the unset() function, you can also use the array_splice() function to delete an element in the array. The array_splice() function removes one or more elements from an array and returns an array of deleted elements. The following is an example of using the array_splice() function to delete an element in an array:

$fruits = array('apple', 'banana', 'cherry', 'dates');

// 删除数组中的 'banana' 元素
$arr_deleted = array_splice($fruits, 1, 1);

// 输出修改后的数组
print_r($fruits);

// 输出已删除的元素
print_r($arr_deleted);

In the above code, we use the array_splice() function to delete the element with the key name 1 in the $fruits array and replace Deleted elements are assigned to the $arr_deleted array. Finally, we output the modified array and deleted elements via the print_r() function.

It should be noted that using the unset() function and array_splice() function will change the index of the array. If you need to keep the original key name unchanged, you can use the array_values() function to reorder the array index. The following is a sample code:

$fruits = array('apple', 'banana', 'cherry', 'dates');

// 删除数组中的 'banana' 元素
unset($fruits[1]);

// 重新排序数组的索引
$fruits = array_values($fruits);

// 输出修改后的数组
print_r($fruits);

In the above code, we first use the unset() function to delete the element with key name 1 in the $fruits array, and then use the array_values() function to reorder the index of the array , and finally the modified $fruits array is output through the print_r() function.

Summary

Through the introduction of this article, we can learn how to delete an element in an array in PHP. The effect of deleting elements can be achieved using both the unset() function and the array_splice() function. Another thing to note is that deleting elements may change the index of the array. Use the array_values() function to reorder the index of the array.

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