Implement dice rolling in posts: use an email like 'dice XdY+Z' to roll.

inc/config.php

@@ -547,6 +547,10 @@
 		'eu' => 'Europe'
 	);
 	*/
+
+	// Allow dice rolling: an email field of the form "dice XdY+/-Z" will result in X Y-sided dice rolled and summed,
+	// with the modifier Z added, with the result displayed at the top of the post body.
+	$config['allow_roll'] = false;
 	
 /*
 * ====================

post.php

@@ -482,6 +482,60 @@ if (isset($_POST['delete'])) {
 	wordfilters($post['body']);
 	
 	$post['body'] = escape_markup_modifiers($post['body']);
+
+	/* Die rolling:
+	* If "dice XdY+/-Z" is in the email field (where X or +/-Z may be missing),
+	* X Y-sided dice are rolled and summed, with the modifier Z added on.
+	* The result is displayed at the top of the post.
+	*/
+	if($config['allow_roll'] && strpos(strtolower($post['email']), 'dice%20') === 0) {
+		$dicestr = str_split(substr($post['email'], strlen('dice%20')));
+
+		// Get params
+		$diceX = '';
+		$diceY = '';
+		$diceZ = '';
+
+		$curd = 'diceX';
+		for($i = 0; $i < count($dicestr); $i ++) {
+			if(is_numeric($dicestr[$i])) {
+				$$curd .= $dicestr[$i];
+			} else if($dicestr[$i] == 'd') {
+				$curd = 'diceY';
+			} else if($dicestr[$i] == '-' || $dicestr[$i] == '+') {
+				$curd = 'diceZ';
+				$$curd = $dicestr[$i];
+			}
+		}
+
+		// Default values for X and Z
+		if($diceX == '') {
+			$diceX = '1';
+		}
+
+		if($diceZ == '') {
+			$diceZ = '+0';
+		}
+
+		// Intify them
+		$diceX = intval($diceX);
+		$diceY = intval($diceY);
+		$diceZ = intval($diceZ);
+
+		// Continue only if we have valid values
+		if($diceX != 0 && $diceY != 0) {
+			$dicerolls = array();
+			$dicesum = $diceZ;
+			for($i = 0; $i < $diceX; $i++) {
+				$roll = rand(1, $diceY);
+				$dicerolls[] = $roll;
+				$dicesum += $roll;
+			}
+
+			// Prepend the result to the post body
+			$post['body'] = 'Rolled ' . implode(', ', $dicerolls) . ' = ' . $dicesum . "\r\n" . $post['body'];
+		}
+	}
 	
 	if ($mod && isset($post['raw']) && $post['raw']) {
 		$post['body'] .= "\n<tinyboard raw html>1</tinyboard>";