How to remove the key name of an array in php

In PHP, array is a very commonly used data type. Array elements usually consist of a key and corresponding value, and the corresponding value can be accessed using the key.

However, in some cases, we need to remove the keys of the array elements and only keep the values. At this time, you need to use some functions in PHP to reconstruct and reorganize the array elements.

This article will introduce some PHP functions that can be used to remove array key names, allowing you to easily meet related needs.

Method 1: Use the array_values ​​function

PHP’s built-in function array_values ​​can return all the values ​​in an array and reset the index of the array. The following is a sample code that uses the array_values ​​function to remove the keys of the array:

$my_array = array('a' => 'hello', 'b' => 'world', 'c' => 'php');
$new_array = array_values($my_array);
print_r($new_array);

The output is as follows:

Array
(
    [0] => hello
    [1] => world
    [2] => php
)

As you can see, using the array_values ​​function, we successfully removed the keys of the $my_array array name and reassemble the values ​​into a new index array.

Method 2: Use array_map function

PHP built-in function array_map can take each element in one or more arrays as a parameter, pass it to a custom function for processing, and form the result A new array is returned. The following is a sample code that uses the array_map function to remove the key name of the array:

$my_array = array('a' => 'hello', 'b' => 'world', 'c' => 'php');
$new_array = array_map('trim', $my_array);
print_r($new_array);

The output result is as follows:

Array
(
    [a] => hello
    [b] => world
    [c] => php
)

As you can see, using the array_map function, we did not remove the key name of the $my_array array. But we can use the trim function to process each element in the array, such as removing spaces at the beginning and end of the string, etc.

Method 3: Use foreach loop

The foreach loop is one of the most basic control structures in PHP. We can use foreach to loop through the array and extract the values ​​of the array elements to form a new array. The following is a sample code that uses a foreach loop to remove array key names:

$my_array = array('a' => 'hello', 'b' => 'world', 'c' => 'php');
$new_array = array();
foreach ($my_array as $value) {
    $new_array[] = $value;
}
print_r($new_array);

The output results are as follows:

Array
(
    [0] => hello
    [1] => world
    [2] => php
)

As you can see, using the foreach loop, we also successfully removed the $my_array array key name and reorganize the values ​​into a new index array.

Method 4: Use loop unset function

In PHP, we can use the unset function to delete elements in the array. By looping through the array, we can remove the key from each element in the array, leaving only the value. The following is a sample code that uses the loop unset function to remove array key names:

$my_array = array('a' => 'hello', 'b' => 'world', 'c' => 'php');
$new_array = array();
foreach ($my_array as $key => $value) {
    unset($my_array[$key]);
    $new_array[] = $value;
}
print_r($new_array);

The output results are as follows:

Array
(
    [0] => hello
    [1] => world
    [2] => php
)

As you can see, using the loop unset function, we also successfully removed The key name of the $my_array array and the values ​​are reorganized into a new index array.

Summary

The above are four commonly used methods to remove array key names. When you need to reconstruct and reorganize the array, you can choose different methods according to actual needs.

When using these functions and methods, you need to pay attention to whether the array needs to be reassigned to a variable after processing, and if the array contains complex type values ​​(such as objects or arrays, etc.), special operations are required. deal with.

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