How to delete certain elements in an array in php

When developing PHP applications, it is often necessary to operate on arrays. Array is a very common data structure that can store a group of related data.

Sometimes we need to delete certain elements from an array. PHP provides some methods to achieve this function.

1. unset function

The unset function is a built-in function of PHP. It can be used to delete one or more variables or one or more variables in an array. elements.

Sample code:

$arr = array("apple", "banana", "cherry", "date");
unset($arr[1]); //删除banana
print_r($arr);

Output result:

Array
(
    [0] => apple
    [2] => cherry
    [3] => date
)

The above code deletes the second element (subscript 1) in the array through the unset function, that is "banana".

2. array_splice function

array_splice function is an array function in PHP. It can be used to delete one or more elements in the array and insert it at the deleted position. New elements. If you are just deleting elements, you can set the number of deletions to 0.

Sample code:

$arr = array("apple", "banana", "cherry", "date");
array_splice($arr, 1, 1); //删除banana
print_r($arr);

Output result:

Array
(
    [0] => apple
    [1] => cherry
    [2] => date
)

The above code deletes the second element (subscript 1) in the array through the array_splice function, that is "banana".

3. array_filter function

The array_filter function is an array function in PHP. It can be used to filter elements in an array and return a new array.

Sample code:

$arr = array("apple", "banana", "cherry", "date");
$arr = array_filter($arr, function($value) {
    return $value != "banana";
});
print_r($arr);

Output result:

Array
(
    [0] => apple
    [2] => cherry
    [3] => date
)

The above code filters the "banana" elements in the array through the array_filter function and returns a new array.

Summary

The above are three ways to delete certain elements in an array in PHP. You can easily delete elements from an array using these methods, making data processing convenient. Depending on the actual application scenario, choosing the appropriate method can improve code readability and execution efficiency.

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