Fatal error: Uncaught Error: Call to undefined function mysql_pconnect() in /volume1/web/rex-2013/Connections/REX_MK.php on line 9

Error: Call to undefined function mysql_pconnect() in /volume1/web/rex-2013/Connections/REX_MK.php on line 9

Call Stack:
    0.0000     359560   1. {main}() /volume1/web/rex-2013/index.php:0
    0.0168     359904   2. require_once('/volume1/web/rex-2013/Connections/REX_MK.php') /volume1/web/rex-2013/index.php:1