After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Boolean type Boolean: the simplest and most useful type
null / 0(单字符) / [ ](空数组)
2020-04-160个赞
Courses in the relevant section：Integer type: seemingly simple but actually very meaningful
php_int_max
2020-04-160个赞
call_user_func_array(‘可变函数’，‘数组参数’)
2020-04-290个赞
Courses in the relevant section：Check whether a key exists in the array: array_key_exists()
array_key_exists ,array_keys,array_values
2020-04-300个赞
Courses in the relevant section：Check whether a value exists in the array: in_array()
in_array(values,array)
2020-04-300个赞
