use NULL in database where possible

inc/functions.php

@@ -567,10 +567,25 @@
 		$query = prepare(sprintf("INSERT INTO `posts_%s` VALUES ( NULL, :thread, :subject, :email, :name, :trip, :capcode, :body, :time, :time, :thumb, :thumbwidth, :thumbheight, :file, :width, :height, :filesize, :filename, :filehash, :password, :ip, :sticky, :locked, 0, :embed)", $board['uri']));
 		
 		// Basic stuff
-		$query->bindValue(':subject', $post['subject']);
-		$query->bindValue(':email', $post['email']);
+		if(!empty($post['subject'])) {
+			$query->bindValue(':subject', $post['subject']);
+		} else {
+			$query->bindValue(':subject', NULL, PDO::PARAM_NULL);
+		}
+		
+		if(!empty($post['email'])) {
+			$query->bindValue(':email', $post['email']);
+		} else {
+			$query->bindValue(':email', NULL, PDO::PARAM_NULL);
+		}
+		
+		if(!empty($post['trip'])) {
+			$query->bindValue(':trip', $post['trip']);
+		} else {
+			$query->bindValue(':trip', NULL, PDO::PARAM_NULL);
+		}
+		
 		$query->bindValue(':name', $post['name']);
-		$query->bindValue(':trip', $post['trip']);
 		$query->bindValue(':body', $post['body']);
 		$query->bindValue(':time', isset($post['time']) ? $post['time'] : time(), PDO::PARAM_INT);
 		$query->bindValue(':password', $post['password']);		

install.sql

@@ -182,9 +182,9 @@ CREATE TABLE IF NOT EXISTS `pms` (
 CREATE TABLE IF NOT EXISTS `posts_b` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `thread` int(11) DEFAULT NULL,
-  `subject` varchar(100) NOT NULL,
-  `email` varchar(30) NOT NULL,
-  `name` varchar(35) NOT NULL,
+  `subject` varchar(100) DEFAULT NULL,
+  `email` varchar(30) DEFAULT NULL,
+  `name` varchar(35) DEFAULT NULL,
   `trip` varchar(15) DEFAULT NULL,
   `capcode` varchar(50) DEFAULT NULL,
   `body` text NOT NULL,

templates/posts.sql

@@ -1,9 +1,9 @@
 CREATE TABLE IF NOT EXISTS `posts_{{ board }}` (
   `id` int(11) NOT NULL AUTO_INCREMENT,
   `thread` int(11) DEFAULT NULL,
-  `subject` varchar(100) NOT NULL,
-  `email` varchar(30) NOT NULL,
-  `name` varchar(35) NOT NULL,
+  `subject` varchar(100) DEFAULT NULL,
+  `email` varchar(30) DEFAULT NULL,
+  `name` varchar(35) DEFAULT NULL,
   `trip` varchar(15) DEFAULT NULL,
   `capcode` varchar(50) DEFAULT NULL,
   `body` text NOT NULL,