Nagios PNP Warning after upgrade php to 5.3

I got these error and warnings from Nagios after I upgrade my PHP:


Deprecated: Assigning the return value of new by reference is deprecated in /usr/local/nagios/share/pnp/include/function.inc.php on line 1032

Warning: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'Europa/Berlin' for 'Debian/Squeeze' instead in /usr/local/nagios/share/pnp/include/function.inc.php on line 557


Deprecated: Function eregi() is deprecated in /usr/local/nagios/share/pnp/include/function.inc.php 

 To solve this problem you must edit this file: usr/local/nagios/share/pnp/include/function.inc.php

line 556: date_default_timezone_set('UTC');

line 1033: $pdf = new PDF('P', 'mm', 'A4');

line 1543: if($level == 2 && $type == "complete" && preg_match("/^NAGIOS_/",$tag)){