How to delete an element in an array in php

In PHP, array is a very common data type. When we need to delete an element in the array, we can use the array_splice() or unset() function to achieve this.

1. Using the array_splice() function

The array_splice() function removes elements of a specified length from an array and replaces them with another set of values. If replacement is not required, the replacement value parameter can be omitted. You can use the array_splice() function according to the following syntax:

array_splice($array, $start, $length, $replacement);

Among them, $array is the array that needs to be operated, $start is the starting position, that is, the position of the element to be deleted, $length is the number of elements to be deleted, $replacement is the element to be replaced (optional).

For example, the following code deletes the element with index 2 in the array $arr:

$arr = array('a', 'b', 'c', 'd', 'e');
array_splice($arr, 2, 1);
print_r($arr);

The output result is as follows:

Array
(
    [0] => a
    [1] => b
    [2] => d
    [3] => e
)

2. Use the unset() function

The unset() function is used to release variables or array elements. The syntax is as follows:

unset($array[$key]);

Among them, $array is the array that needs to be operated, and $key is the key name of the element that needs to be deleted.

For example, the following code deletes the element with key name 2 in array $arr:

$arr = array('a', 'b', 'c', 'd', 'e');
unset($arr[2]);
print_r($arr);

The output result is as follows:

Array
(
    [0] => a
    [1] => b
    [3] => d
    [4] => e
)

Summary

array_splice () function and unset() function can delete elements in the array. If you need to change the length of the array, you can use the array_splice() function. If you only need to remove elements without changing the length of the array, you can use the unset() function.

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