# [EMAIL PROTECTED] / 2006-12-13 14:15:26 +0800: > I'm new here and looking PHP these days, howerver , I'm confused by how it > works, and here is some questions I have. > Is there any old bird wanna help me out? > > 1. I heard there is a zend engine inside PHP playing the role as a virtual > machine, and PHP excution have 2 step, first compile to opcode and then > excute the opcode, > so is that means the php are compiled only once per file? or still need to > recompile when another request issued to the server? also I heard about the > caching extention about php, is it talking about caching the opcode? is't > caching the opcode or excute results? how it shares between the requests?
Both kinds of things exist, with different sharing strategies. > 3. Take linux apache for example, if compiled as a apache module, and using > prefork threading model, for example, if I have 100 process, is that means I > have 100 copy of PHP library local data(I assume only one reentrant > excutable image) in each process? compare to a worker model, like 10 process > and 10 threads in each one process, should it make a difference that we only > have 10 copy of PHP library local data ? Practical concerns make your question moot: even if the basic distribution was all threadsafe, you're bound to hit a library that uses strtok(3) or strerror(3), or static variables. How much of the code you rely on is labelled by its authors as threadsafe? -- How many Vietnam vets does it take to screw in a light bulb? You don't know, man. You don't KNOW. Cause you weren't THERE. http://bash.org/?255991 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
