How to remove the key value of an array in PHP

In PHP, sometimes it is necessary to remove the key values ​​​​in the array, leaving only the value. This article will introduce how to use PHP built-in functions to achieve this function.

1. Use the array_values() function

The array_values() function can return all the values ​​in the array and re-index. For example:

$arr = array('one' => 'PHP', 'two' => 'JAVA', 'three' => 'Python');
$new_arr = array_values($arr);
print_r($new_arr);

Output result:

Array ( [0] => PHP [1] => JAVA [2] => Python )

You can see that the key values ​​in the new array have been removed, leaving only the values.

2. Use foreach loop

We can also use foreach loop to remove the array key value. For example:

$arr = array('one' => 'PHP', 'two' => 'JAVA', 'three' => 'Python');
$new_arr = array();
foreach ($arr as $value) {
    $new_arr[] = $value;
}
print_r($new_arr);

Output result:

Array ( [0] => PHP [1] => JAVA [2] => Python )

You can also see that the key values ​​in the new array have been removed, leaving only the values.

3. Use the array_map() function

The array_map() function can perform the same operation on one or more arrays. We can use an anonymous function to retrieve the value of the array. For example:

$arr = array('one' => 'PHP', 'two' => 'JAVA', 'three' => 'Python');
$new_arr = array_map(function($value) {
    return $value;
}, $arr);
print_r($new_arr);

Output result:

Array ( [one] => PHP [two] => JAVA [three] => Python )

It can be seen that after using the anonymous function, the key values ​​​​in the new array have not been removed. However, we can remove these keys again by using the array_values() function.

Summary:

This article introduces three methods to remove key values ​​​​in PHP arrays, leaving only the values. Among them, using the array_values() function is the simplest and most straightforward, using the foreach loop is more flexible, and using the array_map() function is more advanced. Depending on actual needs, we can choose different methods to solve the problem.

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