I have a PHP class in a large 200KB file. When I do:
include_once('myClass.php');
$theClass = new myClass();
what exactly is loaded into the server’s RAM? Is it the whole 200KB (fields + functions) or only the class fields? Are function definitions only loaded into RAM when they’re called? Should I split this big class into many sub-classes to boost server performance?
No, splitting them won’t do much. If you’re concerned with the memory usage of your scripts, monitor them with
You might want to split it up, and then only load sub-classes of it when you need them.
Two conflicting opinions above: 
The reason my split would be more efficient is because the include would be located inside a function, which you would only call when you need the classes, sub-classes, or functions located inside that file.
But it doesn’t matter, really. When you cache a class it’s available throughout the pipe, not just for the current socket…
Wow, this is very interesting to me. I have always wondered how much memory is being used when I create a class or include a file with PHP… and what should be the maxmium or how much I should stay away from (err… if that could be judged or something, probably depends on the content or site).
May I ask what you guys are getting when you use the function memory_get_usage(true) at the very end of your scripts (after the HTML)? (it also helps to divide by 1024 twice…) I am asking just because I am curious of what the average is… thanks
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