<?php
/*
errors class - Helps management of errors in a script.

@version
	1.0
@author
	Mike Rogers (FullOnDesin.co.uk)
@last updated
	03 June 2009
@usage
	You are free to share, modify and use this code for commercial or non-commercial uses.
	Please give a link back (to http://www.fullondesign.co.uk/ ) if you can, but you don't have you.
	You use this at your own risk.
*/
class errors {
	var $errors_data;

	/*
	Add the error from $new_error into an array of errors.

	@param
		$new_error	string The text related to your error.
	@return:
		True - Error has been Added
	@example
		add_error('Username is Incorrect');
	*/
	public function add_error($new_error){
		$this->errors_data[] = $new_error;
		return TRUE;
	}

	/*
		Outputs the errors.

	@param
		None
	@return:
		- A div (ID - error) which contains the errors.
		NULL - No errors
	@example
		echo output_errors();
	*/
	public function output_errors(){
		if(is_array($this->errors_data)){
			// Cycle through the errors.
			foreach($this->errors_data as $error)	{
				$return .= '<p>'.$error.'</p>';
			}
		// Add it to the error div
		return '<div id="error">'.$return.'</div>';
		}
		return NULL;
	}
}

// @Example - creating the class:
$errors = new errors;

// @Example - Add an error
$errors->add_error('Username is incorrect');

// @Example - Return the errors
echo $errors->output_errors();
?>

If you are looking to fully integrate a script similar to the above, there is a really good post regarding the set_error_handler() function on Tinsology ( PHP Error Handling ).