fixed issue with php 5.3

Florian Schaal

2014-10-24 bdf99f4160bd537cf815eb687c3e062c450d029e

 server/lib/classes/cron.d/500-backup_mail.inc.php

@@ -83,7 +83,9 @@
            foreach($records as $rec) {
               //* Do the mailbox backup
               if($rec['backup_interval'] == 'daily' or ($rec['backup_interval'] == 'weekly' && date('w') == 0) or ($rec['backup_interval'] == 'monthly' && date('d') == '01')) {
                  $sql = "SELECT * FROM mail_domain WHERE domain = '".$app->db->quote(explode("@",$rec['email'])[1])."'";
                  $email = $rec['email'][1];
                  $sql="SELECT * FROM mail_domain WHERE domain = ?" . $app->db->quote(explode("@",$email))."'";
                  unset($email);
                  $domain_rec=$app->db->queryOneRecord($sql);

                  $mail_backup_dir = $backup_dir.'/mail'.$domain_rec['domain_id'];