How does php opcode cache (apc) work with session-specific variables?

Question

Looking at creating my first web application using php and an opcode cache.

I vaguely understand why it's beneficial in theory.

However, in practice - how does apc work with opcodes compiled from session specific variables? If one page (say somesharedpage.php) is cached, how are variables within (that may be different for every user) treated and handled?

Ja͢ck · Accepted Answer · 2012-12-27 00:17:48Z

3

Simply, APC works with code and not data, because data doesn't contain any opcodes.

When should data be added to apc?

Data that you would want to cache using apc_fetch(), apd_store() etc. are ideally values that would take some processing time to get generated, rather than simply "all my globals".

edited Dec 27, 2012 at 0:17

answered Dec 26, 2012 at 23:59

Ja͢ck

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2 Comments

Sam Levin Over a year ago

Are files automatically added to the apc simply by adding it to php and enabling it? When should data be added to apc? Only for global variables? Or static variables I should say (that won't change). And by data I mean arrays, strings, etc that are to be accessed using apc_fetch and apc_store

Ja͢ck Over a year ago

Files would automatically get added to APC upon execution (or rather, just before) or when code is include()ed. Updated answer.

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