PHP uksort() function

The PHP uksort( ) function is used to sort an array by the elements keys using a user-defined comparison function. This function was introduced in PHP 4.0.

Syntax

Parameter

Parameter	Description	Is compulsory
array	Specifies the array to be sorted.	compulsory
user_defined_function	This function is a comparison function and it is used to compare values and sort the array. This function returns three types of values. If a=b, return 0 If a>b, return 1 If a<b, return -1	Optional

Return type

The uksort( ) function returns true on success or false on failure.

Example 1

<?php
function   userfunction($a, $b) 
{
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}
$input = array("d"=>"mango", "a"=>"apple", "b"=>"banana" );
uksort($input, "userfunction");
print_r($input);
?>

Output:

Array
(
    [d] => mango
    [b] => banana
    [a] => apple )

Example 2

<?php
function  compare($x, $y)
{
if ($x == $y) return 0;
return ($x > $y) ? -1 : 1;
}
$language = array("1" => "java","2" => "php", "6" => "python","4" => "ruby");
uksort($language, "compare");
print_r ($language);
?>

Output:

Array
(
    [6] => python
    [4] => ruby
    [2] => php
    [1] => java
)

Example 3

<?php
function   user($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$numbers=array("a"=>9,"b"=>2,"c"=>60,"d"=>78);
uksort($numbers,"user");
print_r($numbers);
?>

Output:

Array
(
    [a] => 9
    [b] => 2
    [c] => 60
    [d] => 78
)

Example 4

<?php
function   myfunction($x, $y)
{
if ($x == $y) return 0;
return ($x > $y) ? -1 : 1;
}
$sports = array("1" => "cricket","2" => "hockey", "8" => "football","4" =>"badminton");
uksort($sports, "myfunction");
print_r ($sports);
?>

Output:

Array
(
    [8] => football
    [4] => badminton
    [2] => hockey
    [1] => cricket
)

Next TopicPHP Array Functions

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