Fatal error: Uncaught Error: Call to undefined function mysql_select_db() in /volume1/web/systemdevelopment1.php on line 106

Error: Call to undefined function mysql_select_db() in /volume1/web/systemdevelopment1.php on line 106

Call Stack:
    0.0002     385112   1. {main}() /volume1/web/systemdevelopment1.php:0