A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257

Fatal error: Uncaught Error: Call to undefined function mysql_pconnect() in /home/storage/a/d3/73/playball/public_html/site/system/database/drivers/mysql/mysql_driver.php:91 Stack trace: #0 /home/storage/a/d3/73/playball/public_html/site/system/database/DB_driver.php(115): CI_DB_mysql_driver->db_pconnect() #1 /home/storage/a/d3/73/playball/public_html/site/system/database/DB.php(148): CI_DB_driver->initialize() #2 /home/storage/a/d3/73/playball/public_html/site/system/core/Loader.php(346): DB(Array, NULL) #3 /home/storage/a/d3/73/playball/public_html/site/system/core/Loader.php(1171): CI_Loader->database() #4 /home/storage/a/d3/73/playball/public_html/site/system/core/Loader.php(152): CI_Loader->_ci_autoloader() #5 /home/storage/a/d3/73/playball/public_html/site/system/core/Controller.php(51): CI_Loader->initialize() #6 /home/storage/a/d3/73/playball/public_html/site/application/controllers/unidades.php(17): CI_Controller->__construct() #7 /home/storage/a/d3/73/playball/public_html/site/system/core/CodeIgniter.php(308): U in /home/storage/a/d3/73/playball/public_html/site/system/database/drivers/mysql/mysql_driver.php on line 91