Buscar valor en un arreglo

<?php

$meals = array('Walnut Bun' => 1,

               'Cashew Nuts and White Mushrooms' => 4.95,

               'Dried Mulberries' => 3.00,

               'Eggplant with Chili Sauce' => 6.50,

               'Shrimp Puffs' => 0);



$dish = array_search(6.50, $meals);

if ($dish) {

    print "$dish costs \$6.50";

}

?>