Help, Convincing upgrade of PHP

I will be generating a dynamic website for a Class in america. (Don't worry about details) The schools technican is the type that doesn't really know what they are talking about. They are running PHP 4.0.6 which is too old for me - Language differances. They say that upgrading to PHP 4.2.3 will put unnessercary load on our server. I have told about the security problem found (Which applys to 4.2.x only, but he doesn't know that). Can anyone think of other excuses. I told about safe mode for security. He said that when they buy a new server they will get the new version of PHP. TO me this suggests that he doesn't know how to compile PHP for Mac OS X server. Does anyone know of some good instructions? -- JJ Harrison webmaster@tececo.com www.tececo.com -- Please reply on the list/newsgroup unless the reply it OT.