php function array_reverse() that returns an array in reverse order

Example

Return the array in reversed order:

<?php
$a=array("a"=>"Volvo","b"=>"BMW","c"=>"Toyota");
print_r(array_reverse($a));
?>

Definition and usage

array_reverse() FunctionReturn the flip Sequential array.

Syntax

array_reverse(array,preserve)

Parameters	Description
array	Required. Specifies an array.
preserve	Optional. Specifies whether to retain the original array key names. If set to TRUE, numeric keys will be preserved. Non-numeric keys are not affected by this setting and will always be retained. Possible values: true false

Technical details

The preserve parameter is

Return value:	Returns the flipped array.
PHP Version:	4+
##Update Log :	new in PHP 4.0.3.

More examples

Example 1

Output the original array, flipped array, and flipped array retaining the original array key names:

<?php
$a=array("Volvo","XC90",array("BMW","Toyota"));
$reverse=array_reverse($a);
$preserve=array_reverse($a,true); 
print_r($a);print_r($reverse);
print_r($preserve);
?>

Example:

<?php
$input = array("php", 4.0, array("green", "red"));
$result = array_reverse($input);
$result_keyed = array_reverse($input, true);
?>

This will make $result and $result_keyed have the same unit, but pay attention to the difference in key names. The printout of $result and $result_keyed respectively shows:

Array
(
 [0] => Array
 (
  [0] => green
  [1] => red
 )
 
 [1] => 4
 [2] => php
)
Array
(
 [2] => Array
 (
  [0] => green
  [1] => red
 )
 
 [1] => 4
 [0] => php
)

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