Better error handling/displaying with $config['debug'] and $config['verbose_errors']

inc/config.php

@@ -42,7 +42,7 @@
 
 	// Shows some extra information at the bottom of pages. Good for development/debugging.
 	$config['debug'] = false;
-	// For development purposes. All this does is turn 'display_errors' on.
+	// For development purposes. Displays (and "dies" on) all errors and warnings. Turn on with the above.
 	$config['verbose_errors'] = true;
 
 	// Directory where temporary files will be created.

inc/display.php

@@ -57,7 +57,7 @@ function createBoardlist($mod=false) {
 	);
 }
 
-function error($message, $priority = true) {
+function error($message, $priority = true, $debug_stuff = false) {
 	global $board, $mod, $config;
 	
 	if ($config['syslog'] && $priority !== false) {
@@ -74,13 +74,13 @@ function error($message, $priority = true) {
 		'config' => $config,
 		'title' => _('Error'),
 		'subtitle' => _('An error has occured.'),
-		'body'=>'<center>' .
+		'body' => Element('error.html', array(
-		        '<h2>' . _($message) . '</h2>' .
+			'config' => $config,
-			(isset($board) ? 
+			'message' => $message,
-				"<p><a href=\"" . $config['root'] .
+			'mod' => $mod,
-					($mod ? $config['file_mod'] . '?/' : '') .
+			'board' => isset($board) ? $board : false,
-					$board['dir'] . $config['file_index'] . "\">"._("Go back")."</a>.</p>" : '') .
+			'debug' => is_array($debug_stuff) ? str_replace("\n", '&#10;', utf8tohtml(print_r($debug_stuff, true))) : utf8tohtml($debug_stuff)
-		        '</center>'
+		))
 	)));
 }
 

inc/functions.php

@@ -155,8 +155,20 @@ function loadConfig() {
 	}
 
 	if ($config['verbose_errors']) {
+		set_error_handler(function($errno, $errstr, $errfile, $errline) {
+			if (error_reporting() == 0)
+				return false; // Looks like this warning was suppressed by the @ operator.
+			error(utf8tohtml($errstr), true, array(
+				'file' => $errfile,
+				'line' => $errline,
+				'errno' => $errno,
+				'error' => $errstr,
+				'backtrace' => array_slice(debug_backtrace(), 1)
+			));
+		});
 		error_reporting(E_ALL);
-		ini_set('display_errors', 1);
+		ini_set('display_errors', true);
+		ini_set('html_errors', false);
 	}
 
 	// Keep the original address to properly comply with other board configurations

inc/image.php

@@ -287,16 +287,16 @@ class ImageConvert extends ImageBase {
 				if (trim($error = shell_exec("gifsicle --unoptimize -O2 --resize {$this->width}x{$this->height} < " .
 					escapeshellarg($this->src . '') . " \"#0-{$config['thumb_keep_animation_frames']}\" > " .
 					escapeshellarg($this->temp) . '2>&1 &&echo $?') !== '0') || !file_exists($this->temp))
-					error($error);
+					error('Failed to resize image!', null, $error);
 			} else {
-				if (trim($error = shell_exec('convert ' . sprintf($config['convert_args'], '', $this->width, $this->height) . ' ' .
+				if (trim($error = shell_exec('aconvert ' . sprintf($config['convert_args'], '', $this->width, $this->height) . ' ' .
 					escapeshellarg($this->src) . ' ' . escapeshellarg($this->temp) . ' 2>&1 &&echo $?')) !== '0' || !file_exists($this->temp))
-					error($error);
+					error('Failed to resize image!', null, $error);
 			}
 		} else {
-			if (trim($error = shell_exec('convert ' . sprintf($config['convert_args'], '-flatten', $this->width, $this->height) . ' ' .
+			if (trim($error = shell_exec('aconvert ' . sprintf($config['convert_args'], '-flatten', $this->width, $this->height) . ' ' .
 				escapeshellarg($this->src . '[0]') . " " . escapeshellarg($this->temp) . ' 2>&1 &&echo $?')) !== '0' || !file_exists($this->temp))
-				error($error);
+				error('Failed to resize image!', null, $error);
 		}
 	}
 }

templates/error.html

@@ -0,0 +1,18 @@
+<div style="text-align:center">
+	<h2 style="margin:20px 0">{{ message }}</h2>
+	{% if board %}
+		<p>
+			<a href="{{ config.root }}{% if mod %}{{ config.file_mod }}?/{% endif %}{{ board.dir }}{{ config.file_index }}">
+				{% trans 'Go back' %}
+			</a>
+		</p>
+	{% endif %}
+</div>
+{% if debug and config.debug %}
+	<hr>
+	<h3>{% trans 'Error information' %}</h3>
+	<pre style="white-space:pre-wrap;font-size: 10px;">
+		{{ debug }}
+	</pre>
+	<hr>
+{%  endif %}