Description:
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I have used PHP 4 and the MySQL fucntions were built in.  I upgraded to version 5 and all my scripts quit working.... come to find out I had to re-enable the extension for it.  On top of that, I had to copy a dll file into my system32 directory.  

Please.... if you are going to include something in one version, leave it as is in the next version.  I had signifigant downtime while trying to figure out what the heck was going on.  

(At least could you add something in the installer to detect the presense of MySQL and move the extensions and files into the proper places)

Reproduce code:
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$DBConn = mysql_connect($DBHost,$DBUser,$DBPass) or die("Unable to connect to database");

Expected result:
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successful connection

Actual result:
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Fatal error: Call to undefined function mysql_connect()