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uksort

(PHP 3>= 3.0.4, PHP 4 )

uksort --  Sort an array by keys using a user-defined comparison function

Description

void uksort ( array array, callback cmp_function)

This function will sort the keys of an array using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function.

Example 1. uksort() example

<?php
function cmp($a, $b) {
    if ($a == $b) {
        return 0;
    }
    return ($a > $b) ? -1 : 1;
}

$a = array(4 => "four", 3 => "three", 20 => "twenty", 10 => "ten");

uksort($a, "cmp");

while (list($key, $value) = each($a)) {
    echo "$key: $value\n";
}
 ?>

This example would display:

20: twenty
10: ten
4: four
 3: three

See also usort(), uasort(), sort(), asort(), arsort(), ksort(), natsort(), and rsort().

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