Sort an array of objects by one of the objects property with PHP

Quicksort algorithm animationIf you want to sort an array of objects but using one of its object properties you can do it with usort, but this could take a lot of time and will be very computational expensive.
So I have implemented one method you can insert into one of your PHP classes. This method implements the quicksort algorithm.

As a result I have experienced a huge performance improvement against usort: one array of objects with 10.000 elements sorted with usort takes ~3.4 sg, and with quicksort algorithm takes, in my samples, ~0.56 sg. Awesome isn’t it?

Just take the code:

/**
* Sort one array of objects by one of the object's property
*
* @param mixed $array, the array of objects
* @param mixed $property, the property to sort with
* @return mixed, the sorted $array
*/
static public function sortArrayofObjectByProperty( $array, $property )
{
    $cur = 1;
    $stack[1]['l'] = 0;
    $stack[1]['r'] = count($array)-1;

    do
    {
        $l = $stack[$cur]['l'];
        $r = $stack[$cur]['r'];
        $cur--;

        do
        {
            $i = $l;
            $j = $r;
            $tmp = $array[(int)( ($l+$r)/2 )];

            // split the array in to parts
            // first: objects with "smaller" property $property
            // second: objects with "bigger" property $property
            do
            {
                while( $array[$i]->{$property} < $tmp->{$property} ) $i++;
                while( $tmp->{$property} < $array[$j]->{$property} ) $j--;

                // Swap elements of two parts if necesary
                if( $i <= $j)
                {
                    $w = $array[$i];
                    $array[$i] = $array[$j];
                    $array[$j] = $w;

                    $i++;
                    $j--;
                }

            } while ( $i <= $j );

            if( $i < $r ) {
                $cur++;
                $stack[$cur]['l'] = $i;
                $stack[$cur]['r'] = $r;
            }
            $r = $j;

        } while ( $l < $r );

    } while ( $cur != 0 );

    return $array;

}