Allow mods to post in locked threads as per the config

inc/config.php

@@ -189,6 +189,8 @@
 	define('MOD_STICKY', MOD_MOD, true);
 	// Lock a thread
 	define('MOD_LOCK', MOD_MOD, true);
+	// Post in a locked thread
+	define('MOD_POSTINLOCKED', MOD_MOD, true);
 	
 	/* Administration */
 	// Display the contents of instant-config.php

post.php

@@ -69,10 +69,7 @@
 		//Check if thread exists
 		if(!$OP && !threadExists($post['thread']))
 			error(ERROR_NONEXISTANT);
-		
-		if(!$OP && threadLocked($post['thread']))
-			error(ERROR_LOCKED);
-		
+			
 		// Check for a file
 		if($OP) {
 			if(!isset($_FILES['file']['tmp_name']) || empty($_FILES['file']['tmp_name']))
@@ -102,6 +99,14 @@
 			if($post['locked'] && $mod['type'] < MOD_LOCK) error(ERROR_NOACCESS);
 		}
 		
+		// Check if thread is locked
+		// but allow mods to post
+		if(!$OP && threadLocked($post['thread'])) {
+			if(!$mod || $mod['type'] < MOD_POSTINLOCKED) {
+				error(ERROR_LOCKED);
+			}
+		}
+		
 		if($post['has_file']) {
 			$size = $_FILES['file']['size'];
 			if($size > MAX_FILESIZE)