Warning: mysqli_query() expects parameter 1 to be mysqli, null given in /volume1/web/et/class/database/DB.php on line 28 Fatal error: Uncaught Error: Call to undefined function mysql_fetch_array() in /volume1/web/jendo/communicationBook/checkName.php:12 Stack trace: #0 {main} thrown in /volume1/web/jendo/communicationBook/checkName.php on line 12