~ Warning: mysqli_connect(): (HY000/2002) ~

如果php connect mysql 時出現以下情況

Warning: mysqli_connect(): (HY000/2002): 
No such file or directory in *****.php on line 8 
Warning: mysqli_query() expects parameter 1 to be mysqli, 
boolean given in *****.php on line 9 
Connect failed

只要將connect DB 由localhost 改回127.0.0.1 就可以了

define('DATABASE_SERVER', '127.0.0.1');