Summary: in this tutorial, you will learn how to use the PHP array_reverse() function to reverse the order of elements in an array.

Introduction to the PHP array_reverse() function

The array_reverse() function accepts an array and returns a new array with the order of elements in the input array reversed.

The following shows the array_reverse() function:

Code language: PHP (php)

The array_reverse() function has two parameters:

• $array is the input array
• $preserve_keys determines if the numeric keys should be preserved. If $preserve_keys is true, the numeric key of elements in the new array will be preserved. The $preserve_keys doesn’t affect the non-numeric keys.

The array_reverse() doesn’t change the input array. Instead, it returns a new array.

PHP array_reverse() function examples

Let’s take some examples of using the PHP array_reverse() function.

1) Simple PHP array_reverse() function example

The following example uses the array_reverse() function to reverse the order of an array:

Code language: HTML, XML (xml)

Output:

Code language: plaintext (plaintext)

How it works.

• First, define an array of three numbers 10, 20, 30.
• Then, use the array_reverse() function to create a new array with the order of elements in the $numbers array reversed.
• Finally, show the reversed array and the $numbers array. As you can see, the $numbers array doesn’t change.

2) Using the PHP array_reverse() function to preserve numeric keys

The following example uses the array_reverse() function to reverse elements of an array. However, it preserves the keys of the elements:

Code language: HTML, XML (xml)

Output:

Code language: PHP (php)

Summary

• Use the PHP array_reverse() function to reverse the order of elements in an array.
• Set the $preserve_keys to true to preserve the keys in the original array.