php_usort

<?php

$nbrs = array("a" => 123, "b" => 675, "c" => 55, "d" => 479);

echo '<pre>';
echo '<em>Unsorted array</em><br>';
var_dump($nbrs);

echo '<br>';

usort($nbrs, function($a, $b){
    if( $a < $b )
        return -1;
    if( $a==$b )
        return 0;
    if( $a > $b )
        return 1;
});
echo '<em>Sorted array</em><br>';
var_dump($nbrs);


?>