array_reverse()

Published Sep 9, 2023
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The array_reverse() function reverses the items in an array and returns that reversed array.

Syntax

array_reverse(array, preserve_keys)
  • array: The array to reverse.
  • preserve_keys: Optional argument that defaults to false if omitted. If set to true, the keys of the original, non-reversed array will be preserved.

Note: If the keys used are non-numeric, they will always be preserved, regardless of whether the preserve_keys argument is used.

Example

This example returns the reversed array $a using the array_reverse() method.

<?php
$a = array(0=>"andrew",1=>"byrne",2=>"hozier",3=>"unreal");
print_r(array_reverse($a));
?>

This is the output:

Array
(
[0] => unreal
[1] => hozier
[2] => byrne
[3] => andrew
)

This example uses the preserve_keys argument while calling the array_reverse() method to return $a.

<?php
$a = array(0=>"andrew",1=>"byrne",2=>"hozier",3=>"unreal");
print_r(array_reverse($a, true));
?>

This is the output:

Array
(
[3] => unreal
[2] => hozier
[1] => byrne
[0] => andrew
)

Codebyte Example

The following codebyte example can be run and calls the array_reverse() method three times. The second call uses the preserve_keys argument. And the third call shows that non-numeric keys are preserved automatically, even if the preserve_keys argument is not given.

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