// 删除数组内特定元素 function array_delete ($needle, $haystack, $all = true) {     $haystack_updated = $haystack;     foreach ($haystack as $num => $val) {         if ($val == $needle && $all) {             unset ($haystack_updated [$num]);         }         elseif ($val == $needle && $all === false && !isset ($done)) {             $done = true;             unset ($haystack_updated [$num]);         }     }     $haystack_updated = array_values ($haystack_updated);     return $haystack_updated; }