How to remove key names from multidimensional array in PHP

PHP, as a popular programming language, often uses arrays when processing data. As a container for storing large amounts of data, arrays can store different types of values, including numbers, strings, objects, etc. In PHP, sometimes we need to traverse a multi-dimensional array and remove the keys in the array, leaving only the values. This article will introduce how to remove the key names of multi-dimensional arrays in PHP.

1. Understanding PHP arrays

In PHP, arrays are containers used to store values ​​of different data types. Arrays can be created in two ways:

1. Use the array() function:

$fruits = array("Apple", "Banana", "Pear");

2. Use abbreviation:

$fruits = ["Apple", "Banana", "Pear"];

PHP arrays can contain other arrays (multidimensional arrays), And each array element is assigned a key name. Key names can be integers or strings.

For example:

$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");

Key names can be used to reference and access the value of an element. The following is an example of accessing array elements:

echo $person["name"]; // Output Xiaoming

2. Remove the key name of the PHP multidimensional array

Yes Sometimes, we need to traverse a multi-dimensional array and only retain the values ​​in the array, removing the key names. PHP provides many methods to achieve this function, and this article introduces two of them.

1. Use array_values() function

array_values() function returns a new array containing all the values ​​in the original array, but the key names are reset to numeric indexes starting from 0 . This method does not modify the original array.

For example:

$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");
$values ​​= array_values($person);
print_r($values);

This will output:

Array
(

[0] => 小明
[1] => 18
[2] => 男

)

2. Traverse the array and use the unset() function to remove the key name

Another method is to use a loop to traverse the array and use the unset() function to remove the key name. This method modifies the original array, so use it with caution.

For example:

$person = array("Name" => "Xiao Ming", "Age" => "18", "Gender" => "Male");
foreach ($person as $key => $value) {

unset($person[$key]);
$person[] = $value;

}
print_r($person);

This will output:

Array
(

[0] => 小明
[1] => 18
[2] => 男

)

3. Summary

Arrays in PHP are very powerful data structures and support multi-dimensional arrays. When processing data, sometimes it is necessary to remove the key names in the array to facilitate other operations. PHP provides the array_values() function and the traversal method using the unset() function to implement this function. Choose the most suitable method according to actual needs.

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