usort()'un guzel bir ozelligi

sort

<?php

$a[] = array(
    "name"  => "emre",
    "price" => 99,    
);

$a[] = array(
        "name"  => "ali",
        "price" => 15,    
);

$a[] = array(
        "name"  => "ali",
        "price" => 35,    
);


$a[] = array(
        "name"  => "aai",
        "price" => 19,    
);


function sort_by_value($b, $c) {
    return strcmp($b["price"], $c["price"]);
}

usort($a, "sort_by_value");
print_r($a);

?>