When I use the following code after loading the community Zabbix API PHP class (http://www.zabbix.com/forum/showthread.php?p=68628#post68628):

"ZabbixAPI::fetch_array('event','get',array())"

And print_r the results, I get

"Array ( [0] => )"

The execution time of the fetch_array is LONG, and CPU is pegged (apache process, we use mod_php so I assume it's php pegging the CPU).