CakePHP 2.x系でデバッグレベルを環境変数で操作する

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, model caches 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.
 */
if (env('PROD') === '1') {
    Configure::write('debug', 1);
} else {
	Configure::write('debug', 2);
}