New, beautiful exception handler

system/exception.php

@@ -0,0 +1,47 @@
+<?php
+
+require LIBS . 'SensitiveException.php';
+
+/**
+ * @param Exception $exception
+ */
+function exception_handler($exception) {
+	$message = $exception->getMessage();
+	if($exception instanceof SensitiveException) {
+		$message = 'This error is sensitive and will be logged into system/logs/error.log.<br/>View this file for further informations.';
+
+		// log error to file
+		$f = fopen(LOGS . 'error.log', 'ab');
+		if(!$f) {
+			$message = 'We wanted to save detailed informations about this error, but file: ' . LOGS . "error.log couldn't be opened for writing.. so the detailed information couldn't be saved.. are you sure directory system/logs is writable by web server? Correct this, and then refresh this site.";
+		}
+		else {
+			fwrite($f, '[' . date(DateTime::RFC1123) . '] ' . $exception->getMessage() . PHP_EOL);
+			fclose($f);
+		}
+	}
+
+	$backtrace_formatted = nl2br($exception->getTraceAsString());
+
+	// display basic error message without template
+	// template is missing, why? probably someone deleted templates dir, or it wasn't downloaded right
+	$template_file = SYSTEM . 'templates/exception.html.twig';
+	if(!file_exists($template_file)) {
+		echo 'Something went terribly wrong..<br/><br/>';
+		echo "$message<br/><br/>";
+		echo 'Backtrace:<br>';
+		echo $backtrace_formatted;
+		return;
+	}
+
+	// display beautiful error message
+	// the file is .twig.html, but its not really parsed by Twig
+	// we just replace some values manually
+	// cause in case Twig throws exception, we can show it too
+	$content = file_get_contents($template_file);
+	$content = str_replace(array('{{ BASE_URL }}', '{{ message }}', '{{ backtrace }}', '{{ powered_by }}'), array(BASE_URL, $message, $backtrace_formatted, base64_decode('UG93ZXJlZCBieSA8YSBocmVmPSJodHRwOi8vbXktYWFjLm9yZyIgdGFyZ2V0PSJfYmxhbmsiPk15QUFDLjwvYT4=')), $content);
+
+	echo $content;
+}
+
+set_exception_handler('exception_handler');