APC (as in http://us3.php.net/manual/en/book.apc.php) stands for Alternative PHP Cache. What is it alternative to - is there another, built-in caching framework in PHP?
4 Answers
There is no built-in OP-Code or variable cache built in. But there are a number of alternatives...
I believe it was an alternative to the proprietary (and commercial) Zend Cache which was around in the late '90s and early 2000's. There are a number of different accelerators out there now (each with their own advantages and disadvantages), but in the early 2000's, the main one was Zend Cache. So I would assume (the time scales look right) that APC was meant to be an alternative to Zend Cache (an open source and free alternative)...

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Memcached is also widespread.
Also see this List of PHP accelerators which speak of:
- Alternative PHP Cache
- eAccelerator
- ionCube PHP Accelerator
- Turck MMCache
- XCache
- Nusphere PhpExpress
- Zend Accelerator
- Zend Platform
- Windows Cache Extension for PHP

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An alternative to not using one at all?
Seriously though, maybe as an alternative to eAccelerator and Xcache?
Also see: apc vs eaccelerator vs xcache

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