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# uksort

(3.0.4 - 3.0.18 only, PHP 4 >= 4.0.0)

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

## Description

``void uksort` (array array, function 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
    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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