How to remove keys from an array in PHP

In PHP, an array is a very useful data structure that can store multiple data values ​​and use a key to access each value. However, sometimes we need to remove the keys from the array and keep only the values. This article will introduce how to remove the keys of an array in PHP.

1. Use the array_values ​​function

PHP’s built-in function array_values ​​can return a new array that contains all the values ​​in the source array, but the keys are reset to consecutive integers starting from 0 index. Here is an example:

$array = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry');
$values = array_values($array);
print_r($values);

输出：
Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
)

In the above example, we first define an array with keys. We then called the array_values ​​function to remove the keys and store the result in the $values ​​variable. Finally, we printed the values ​​of the new array using the print_r function.

2. Use loop traversal

Another method is to use a loop to traverse the array and store each value in a new array. Here is an example:

$array = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry');
$values = array();

foreach($array as $value){
    $values[] = $value;
}

print_r($values);

输出：
Array
(
    [0] => apple
    [1] => banana
    [2] => cherry
)

In the above example, we first define an array with keys. We then created an empty array $values, used a foreach loop to iterate over the original array, and store each value into the new array. Finally, we printed the values ​​of the new array using the print_r function.

3. Use the array_map function

PHP’s built-in function array_map can apply a function to each element of the array and return a new array. Here is an example:

$array = array('a' => 'apple', 'b' => 'banana', 'c' => 'cherry');
$values = array_map(function($value){return $value;}, $array);

print_r($values);

输出：
Array
(
    [a] => apple
    [b] => banana
    [c] => cherry
)

In the above example, we first define an array with keys. We then use the array_map function to apply an anonymous function to each element of the original array and return a new array containing the same values, but with the keys not removed. Finally, we printed the values ​​of the new array using the print_r function.

Summary

There are many ways to remove the keys of an array in PHP, such as using the array_values ​​function, loop traversal and array_map function. Which method you choose depends on your specific situation and personal preference. Either way, you can easily remove the keys from the array and keep only the values.

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