php delete a certain value from an array

In PHP, there are many ways to delete values ​​in an array. The commonly used method is to use the unset() function or the array_splice() function. This article will introduce the use of these two methods and their differences.

1. Use the unset() function to delete a certain value in the array

The unset() function is a function that comes with PHP and can be used to destroy variables. When deleting a value in an array, you only need to pass the key where the value is located as a parameter to the unset() function.

The following is an example that shows how to use the unset() function to delete the specified value from an array:

// 假设有一个数组
$array = array("apple", "orange", "banana");

// 使用 unset() 函数删除 "orange" 这个值
unset($array[1]);

// 输出结果
print_r($array);

Run the above code, the output is as follows:

Array
(
    [0] => apple
    [2] => banana
)

It can be seen from the results that the second element "orange" in the array has been successfully deleted.

2. Use the array_splice() function to delete a certain value in the array

array_splice() is another function in PHP that can also be used to delete a certain value in the array. Unlike the unset() function, the array_splice() function can copy data between arrays.

The following is an example showing how to use the array_splice() function to delete specified values ​​from an array:

// 假设有一个数组
$array = array("apple", "orange", "banana");

// 使用 array_splice() 函数删除 "orange" 这个值
array_splice($array, 1, 1);

// 输出结果
print_r($array);

Run the above code, the output is as follows:

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

It can be seen from the results that the second element "orange" in the array has been successfully deleted.

3. The difference between unset() and array_splice() functions

The unset() function and array_splice() function can both be used to delete a certain value in the array, but their Usage methods and features vary.

1. The unset() function can only delete the value corresponding to the specified key in the array, but cannot delete it. And using the unset() function to delete an element in the array will not change the element afterward. The key value of the element.
2. array_splice() function can copy the values ​​in an array to another array, or copy the values ​​of another array to the current array. This makes it more flexible than the unset() function.
3. When you use the unset() function to delete an element in the array, the key of the element is retained, and when you use the array_splice() function to delete an element in the array, the key of the array is reset.

In short, whether you use the unset() function or the array_splice() function, deleting a value in the array is very simple. The appropriate method needs to be selected based on the specific situation. No matter which method you use, you should remember to test the deletion results to ensure that the deletion operation was successful.

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