Improved core.php file for CakePHP Change the debug level whether you are in local or production mode.

core.php

<?php
/**
 * CakePHP Debug Level:
 *
 * Production Mode:
 *     0: No error messages, errors, or warnings shown. Flash messages redirect.
 *
 * Development Mode:
 * 	1: Errors and warnings shown, models refreshed, flash messages halted.
 * 	2: As in 1, but also with full debug messages and SQL output.
 *
 * In production mode, flash messages redirect after a time interval.
 * In development mode, you need to click the flash message to continue.
 */
 	$host_r = explode('.', $_SERVER['SERVER_NAME']);
	if(count($host_r)>2) while(count($host_r)>2)array_shift($host_r);
	$mainhost = implode('.', $host_r);

	#switch between servers
	switch(strtolower($mainhost)) {
		case 'localhost':
			Configure::write('debug', 2);
			break;
		case '{your live url}':
			Configure::write('debug', 0);
			break;
		default:
			Configure::write('debug', 0);
	}