PHP array_reverse()

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));
?>

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This is the output:

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

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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));
?>

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This is the output:

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

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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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