After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Check whether a key exists in the array: array_key_exists()
检测某键名是否存在于数组中:array_key_exists()
检测某键名是否存在于数组中:array_key_exists()
2020-03-270个赞
Courses in the relevant section：Check whether a value exists in the array: in_array()
检测数组中是否存在某个值:in_array()
检测数组中是否存在某个值:in_array()
2020-03-270个赞
