Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\phpStudy\www_web\sudamath\yuekan\config.php:13 Stack trace: #0 C:\phpStudy\www_web\sudamath\yuekan\index.php(2): require() #1 {main} thrown in C:\phpStudy\www_web\sudamath\yuekan\config.php on line 13