We are having this exact problem but with SQL Server instead of MYSQL: Script dies without error after calling mysql_connect()
(the mssql_pconnect command instead of mysql_pconnect)
However, we downloaded the dll and linked the extension in the php.ini file as suggested and it still isnt working. We are working on a Windows 2008 Standard R2 with IIS 7.0
We're getting an "undefined function: mssql_pconnect" in the php log
Any ideas what might be wrong?