関連ワード:  php check if array exists in array    php check if array exists in another array    php check if array contains array    php check if array key exists in another array    php check if array value exists in another array    php check if array element exists in another array    php check if array contains another array    php check if value exists in array of arrays    php check if all elements in array exist in another array    php check if array contains value from another array