Zabbix 1.8 required PHP 5.0 or later, but several files does not correspond to the syntax of PHP 5.0:

• include/triggers.inc.php
• include/func.inc.php
• include/classes/class.cvalidator.php
• include/maps.inc.php
• include/hosts.inc.php
• api/classes/class.cmaintenance.php
• api/classes/class.cscreenitem.php
• api/classes/class.citem.php
• api/classes/class.chost.php

Error message:

Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in include/triggers.inc.php on line 2723
Errors parsing include/triggers.inc.php