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If eAccelerator uses an opcode cache for PHP requests, then why don't all companies employ this on their production servers? Is there a reason why Apache/PHP/mod_php doesn't bundle it with their package?

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up vote 1 down vote accepted

Not all packages/scripts play nice with eAccelerator. And eAccelerator will never make it into PHP, because APC -- Advanced PHP Cache -- is set to be included in PHP 5.4, and is generally considered better than eAccelerator.

Also, not all web servers use PHP as an Apache module (mod_php); in shared web hosting, it is quite common to run PHP on a per-user basis with suphp or fastcgid. eAccelerator doesn't work well with fastcgid, much less so suphp.

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