PHP: Does "require 'file.php'" included from disc every time a user request it?

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Does PHP cached content of required files or every time they read from disk? I know there is tools like APC but I want to know is PHP smart enough to do something like this?

If it's so then how PHP track changes or know when a file needs to be cached again?

Thanks

asked 1 min ago

SAMPro

322

PHP: Does "require 'file.php'" included from disc every time a user request it?