[ticket/7716] Data too long for column 'message_subject'

PHPBB3-7716

phpBB/includes/functions_privmsgs.php

@@ -1316,6 +1316,10 @@ function submit_pm($mode, $subject, &$data, $put_in_outbox = true)
 	// Recipient Information
 	$recipients = $to = $bcc = array();
 
+	// First of all make sure the subject are having the correct length.
+	// To achieve this without cutting off between special chars we convert to an array and then count the elements.
+	$subject = truncate_string($subject);
+
 	if ($mode != 'edit')
 	{
 		// Build Recipient List