Well, if you want to run it on Weblogic webserver I THINK that you should run it either as a cgi or as a servlet (php can be compiled as a servlet).
Well everyone knows that a cgi is worse that a native module (like apache mod_php) and I read on the usenet that many people had problem running php as a servlet (but this is something that I just read so you better verify it yourself).
ciao,
Marco