PHP ʖ²ἯTH º󍋼/A array_key_exists =ד 1. array_key_exists() =ד $search_array = array("first" = 1, "second" = 4); if (array_key_exists("first", $search_array)) {echo "The 'first' element is in the array";} ע: Ԛ PHP 4.0.6 ֐±¾º¯ʽûΪ key_exists()¡£ º󍋼/A ưµ㼯A array_intersect ɏһ¼¶ array_keys