The [z]end command in hphpd runs the last manually entered snippet of php in "zend". If you typed 'z' before actually entering any php, it would segfault. Fixed a minor bug in Process::Exec, and present help if none entered. Also clarified that it will simply use your system's default php, and made it so you can override which exe to use with a hphpd config variable. The default is "php", since that is most commonly used.