例如：

$numbers= array(1,2,3,4,5,6,7,8,9,0);
$letters = array('a','b','c','d','e','f','g');

foreach($letters as $letter) {
    foreach($numbers as $number) {
        switch($letter) {
           case 'd':
               // So here I want to 'break;' out of the switch,'break;' out of the
               // $numbers loop,and then 'continue;' in the $letters loop.
               break;
        }
    }

    // Stuff that should be done if the 'letter' is not 'd'.

}

可以这样做,语法是什么？