PHP array_reverse() function

The array_reverse() function is a inbuilt function of PHP. The array_reverse( ) function is used to reverse the order of the elements in an array. This function was introduced in PHP 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies an array.	compulsory
preserve_keys	Specify TRUE or FALSE whether function is preserved the array?s keys or not. The default value is FALSE.	Optional

Return type

The array_reverse() function returns the reversed array.

Example 1

<?php
$a  = array("javatpoint", 2.0, array("PHP", "JAVA"));
$reversed = array_reverse($a);
$preserved = array_reverse($a, true);
print_r($a);
print_r($reversed);
print_r($preserved);
?>

Output:

Array ( [0] => javatpoint [1] => 2 [2] => Array ( [0] => PHP [1] => JAVA ) ) Array ( [0] => Array ( [0] => PHP [1] => JAVA ) 
[1] => 2 [2] => javatpoint ) Array ( [2] => Array ( [0] => PHP [1] => JAVA ) [1] => 2 [0] => javatpoint )

Example 2

<?php
$num= array(100,200,300,400,500);
$x = array_reverse($num,true);
$y = array_reverse($num);
print_r($x);
print_r($y);
?>

Output:

Array ([4] => 500 [3] => 400 [2] => 300 [1] => 200 [0] => 100) Array ([0] => 500 [1] => 400 [2] => 300 [3] => 200 [4] => 100)

Example 3

<?php
$lang = array("a"=>"PHP","b"=>"JAVA","c"=>"PYTHON");
print_r(array_reverse($lang));
?>

Output:

Array ( [c] => PYTHON [b] => JAVA [a] => PHP )

Example 4

<?php
function Reverse($array)
{
return(array_reverse($array, true));
}
$lang = array("PHP", "JAVA", "PERL", "PYTHON");
print_r($lang);
print_r(Reverse($lang));
?>

Output:

Array ( [0] => PHP [1] => JAVA [2] => PERL [3] => PYTHON ) Array ( [3] => PYTHON [2] => PERL [1] => JAVA [0] => PHP )

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