Unidentified error PHP/MySQL - home directory directive

Issue
When attempting to connect to a MySQL database through Dreamweaver MX the following error occurs:

Reason
A cause for this error may be that the "." (or "look in the home directory" directive) has been removed from the "include_path =" line in the PHP configuration file named php.ini, or the entire line has been commented out. Dreamweaver MX relies on some pre-written scripts to create and test database connections to the database server while designing your site.

The scripts for the PHP/MySQL server model were written to use the default configuration of PHP. In other words, the Dreamweaver MX scripts look for these scripts in the home directory first before searching elsewhere for the include files. If the "." directive has been removed from the include_path line in the php.ini file, Dreamweaver MX will not know that these scripts exist and cannot make a successful database connection.

Note: By default, the include_path in the php.ini file in Windows is commented out.

Solutions
There are two ways to resolve this issue:

Concatenate the "." to the "include_path=" line of the php.ini file:

Note: In some cases the "include_path=" line may be commented by a ";" at the beginning of the line. Remove the ";" at the beginning of the line.

The second solution is to alter the file that helps to build and test Dreamweaver's connection script. This solution is only recommended if you don't have access to the php.ini file or the "include_path" cannot be altered for other reasons.

The file that needs to be changed is called MMHTTPDB.php. You can find this file in the Dreamweaver MX installer folder (the default is C:\Program Files\Macromedia\Dreamweaver MX\Configuration\Connections\Scripts\PHP_MySQL\_mmDBScripts and in Mac OS X, the path is Hard Drive:Applications:Macromedia Dreamweaver MX:Configuration:Connections:Scripts:PHP_MySQL:_mmDBScripts).

Once you have found the file make a backup of it. Open the original in Dreamweaver or any text editor and look for line 15.

Line 15 of the MMHTTPDB.php file reads:
  require("mysql.php");

Change it to read:
 require("./mysql.php");

It is important to include the semi-colon or the quotes. Save the file in the _mmDBScripts directory. Close and restart Dreamweaver and create a brand new file attempting the connection again.

Additional Information
For more information on how to configure the php.ini file, check the PHP documentation.