Sort a multidimensional array by one of its fields

$products = array( array( name=>"A", price=>4.5  ),
                   array( name=>"C", price=>5.5  ),
                   array( name=>"D", price=>2.5  ),
                   array( name=>"B", price=>2.5  )
);
 
function priceCmp( $a, $b ){
    if ( $a[price] == $b[price] )
        return 0;
    if ( $a[price] < $b[price] )
         return -1;
    return 1;
}
usort( $products, priceCmp );
foreach ( $products as $val )
     print "$val[name]: $val[price]
n";

Sorting within an class:

class example{
        private $data_array_sort;
       
        public function sort_array($arr,$sort){
                $this->data_array_sort = $sort;
                usort($arr,array($this,"getRecordsSort"));
        }
       
        private function getRecordsSort($a,$b){
                if ( $a[$this->data_array_sort] == $b[$this->data_array_sort] ){
                        return 0;
                }
                if ( $a[$this->data_array_sort] < $b[$this->data_array_sort] )
                        return -1;
                return 1;
        }
}