How to delete specified value from array in PHP

PHP Arrays are one of the most commonly used data types by developers. When we are dealing with arrays, we often need to delete one or more elements in the array. Or we need to delete a specified value in the array. In this post, I will explain how to delete a specified value from an array in PHP.

In PHP, we can use some built-in functions to delete specified values ​​in an array. The following are several frequently used functions:

1. unset() function

unset()The function is used to delete the specified items in the array. element.

$array = array("banana", "apple", "orange");
unset($array[1]); //删除数组中的第二个元素
print_r($array);

Running results:

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

We can see that the specified element is successfully deleted from the array using the unset() function. In this example, we delete the second element in the array, which is "apple".

2. array_diff() function

array_diff()The function can be used to delete specified elements from an array. What it does is return a new array containing the differences between the target array and one or more arrays. This function receives two or more arrays as arguments and removes from the first array all elements present in other arrays.

$array1 = array("banana", "apple", "orange", "grape");
$array2 = array("apple", "grape");
$result = array_diff($array1, $array2);
print_r($result);

Running result:

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

In this example, we create two arrays and then use the array_diff() function to delete the first array The elements "apple" and "grape" in the two arrays get a new array $result.

3. array_splice() function

array_splice() function is used to delete or replace elements in an array. Its main function is to split the array into two or more parts and delete or replace the specified elements.

$array = array("banana", "apple", "orange", "grape");
array_splice($array, 1, 1);
print_r($array);

Running result:

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

In this example, we use the array_splice() function to delete the second element "apple" from the array. This function receives three parameters. The first parameter is the array to be deleted, the second parameter is the starting position to be deleted, and the third parameter is the number of elements to be deleted.

4. array_filter() function

array_filter()The function is used to filter elements in an array. It receives an array as argument and returns a new array containing only elements that satisfy the specified condition. In this example, we use the array_filter() function to filter the specified value in the array and get a new array containing only the remaining values.

$array = array("banana", "apple", "orange", "grape");
$result = array_filter($array, function($value) {
    return $value != 'apple';
});
print_r($result);

Running results:

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

Summary

In PHP, we can use multiple built-in functions to delete specified values ​​in an array. Whether you use the unset() function, the array_diff() function, the array_splice() function, or the array_filter() function, you can Comes into play when deleting a specified value from an array. The most important thing is to choose the function that best suits you in the project.

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