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I encountered the following error while creating an Apache2 virtual host.

You don't have permission to access / on this server

Finally, I figured out the web server user did not have execute permission on one of the parent directories. If you encounter this error, make sure your Apache2 user, www-data on Ubuntu, has the correct file permissions on the site root directory, and all files and directories below the site root.

I ran into the following warning while using a validation rule in CakePHP: 

Warning (2): preg_match() [function.preg-match]: Delimiter must not be alphanumeric or backslash [CORE/cake/libs/model/model.php, line 2431] 

The problem was I spelled the validation rule incorrectly. I used 'nonempty' instead of 'notempty'. The correct usage is:

var $validate = array(
  'description' => array('notempty'),
);

If you experience this error, then make sure all built in validation rules are spelled correctly.

I discovered the CakePHP framework only several weeks ago, and I'm already creating useful web applications with little effort. After briefly looking at several PHP frameworks, I chose to start learning CakePHP because I could easily find documentation on getting started. Once I learned how to use the bake feature to automatically build a skeleton for my application, I was hooked.