getting error
Call to undefined function mysql_connect()
tring to run php website on IIS 7.5.
php.ini file (check phpinfo() if in doubt)Locate the line saying
extension=php_mysql_libmysql.dll
and make sure it is uncommented (no ; in front)
Had the same problem on Windows 7 and IIS
My solution was to add a registry key where to read the php.ini from: http://php.net/manual/en/configuration.file.php
Computer needed a restart after the key was added.
Other with similar solution but for Apache Command Line PHP mysql_connect() Error
On Linux (Ubuntu here specifically) make sure the package php5-mysql is installed. (And restart apache after doing so, with service apache2 restart or /etc/init.d/apache2 restart)
I realize this thread is very old, but I Googled this exact error for hours including several articles here before finding a solution elsewhere...
On Windows, make sure you add a server environment variable telling it which PHP.INI file to load on startup.
PHPRC = [path to your php.ini]
See that the version 5.2 still support mysql but starting with 5.4, php dumped mysql and mysqli for mysqlnd so this may cause your problem(at least it was for me)