Error after upgrading PHP and MySQL
 

I get this error after upgrading PHP to 5.2.8 and MySQL to 5.0.67-community:

Quote:
Fatal error: Call to undefined function mysqli_init() in /home/talkcelt/public_html/forum/includes/class_core.php on line 1128
I've also tried changing MySQL back to 'mysql' in config.php and get this:

Quote:
Fatal error: Call to undefined function mysql_init() in /home/talkcelt/public_html/forum/includes/class_core.php on line 311