<?php
/**
 * Piwik - Open source web analytics
 * 
 * @link http://piwik.org
 * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
 * 
 * @category Piwik
 * @package Piwik
 */

/**
 * Error handler used to display nicely errors in Piwik
 *
 * @param int     $errno    Error number
 * @param string  $errstr   Error message
 * @param string  $errfile  File name
 * @param int     $errline  Line number
 * @return void
 */
function Piwik_ErrorHandler($errno, $errstr, $errfile, $errline)
{
	// if the error has been suppressed by the @ we don't handle the error
	if( error_reporting() == 0 )
	{
		return;
	}

	if(function_exists('debug_backtrace'))
	{
		$backtrace = '';
		$bt = @debug_backtrace();
		if($bt !== null && isset($bt[0]))
		{
			foreach($bt as $i => $debug)
			{
				$backtrace .= "#$i  "
					.(isset($debug['class']) ? $debug['class'] : '')
					.(isset($debug['type']) ? $debug['type'] : '')
					.(isset($debug['function']) ? $debug['function'] : '')
					.'(...) called at ['
					.(isset($debug['file']) ? $debug['file'] : '').':'
					.(isset($debug['line']) ? $debug['line'] : '').']'."\n";
			}
		}
	}
	else
	{
	 	ob_start();
 		@debug_print_backtrace();
 		$backtrace = ob_get_contents();
 		ob_end_clean();
	}

	try {
		Zend_Registry::get('logger_error')->logEvent($errno, $errstr, $errfile, $errline, $backtrace);
	} catch(Exception $e) {
		// in case the error occurs before the logger creation, we simply display it
		print("<pre>$errstr \nin '$errfile' at the line $errline\n\n$backtrace\n</pre>");
		exit;
	}
	switch($errno)
	{
		case E_ERROR:
		case E_PARSE:
		case E_CORE_ERROR:
		case E_CORE_WARNING:
		case E_COMPILE_ERROR:
		case E_COMPILE_WARNING:
		case E_USER_ERROR:
			exit;
		break;
		
		case E_WARNING:
		case E_NOTICE:
		case E_USER_WARNING:
		case E_USER_NOTICE:
		case E_STRICT:
		case E_RECOVERABLE_ERROR:
		case E_DEPRECATED:
		case E_USER_DEPRECATED:
		default:
			// do not exit
		break;
	}
}
