Despite google dropping ball on this one, some good may come from it having spurred Gwynne Raskind's reply: Anyone out there writing PHP might find real optimiz

Despite google dropping ball on this one, some good may come from it having spurred Gwynne Raskind's reply: Anyone out there writing PHP might find real optimization value from Alex Songe comments, concluding with (following Gwynne's article): Good resources (written by the guys who actually work on the php engine): http://ilia.ws/files/phptek2007_performance.pdf http://ilia.ws/files/phptek2007_performance.pdf 
 (13 MB) http://ilia.ws/files/phpquebec_2009.pdf http://ilia.ws/files/phpquebec_2009.pdf ( 1.1 MB ) edit: added file size