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Subject: Re: [PHP-DEV] Is OpCache enabled by default in php 5.5 and later
 or not?
From: rowan.collins@gmail.com (Rowan Collins)

j adams wrote on 05/03/2015 16:12:
> I don't know if this is a question for the documentation team or not, but
> figured I'd start here. There does not appear to be any definitive, clear,
> reliable information on PHP's op caching functionality in recent 5.*
> versions and this problem needs to be remedied.
>
> Question 1: Is OpCache enabled by default in php 5.5 and later or not?
>
> This page:
> http://php.net/manual/en/intro.opcache.php
> says "This extension is bundled with PHP 5.5.0 and later, and is »
> available in PECL for PHP versions 5.2, 5.3 and 5.4."
>
> But this page:
> http://php.net/manual/en/opcache.installation.php
> says "PHP 5.5.0 and later
>
> OPcache can only be compiled as a shared extension. If you have disabled
> the building of default extensions with --disable-all , you must compile
> PHP with the --enable-opcache option for OPcache to be available.
>
> Once compiled, you can use the zend_extension configuration directive to
> load the OPcache extension into PHP. This can be done with
> zend_extension=/full/path/to/opcache.so on non-Windows platforms, and
> zend_extension=C:\path\to\php_opcache.dll on Windows."
>
>
>
> Question 2:
> If OpCache is enabled, does it require any php.ini settings or not? Does it
> show any functions or constants or phpinfo() that will reveal its
> existence?  I've got php 5.6.6 installed on CentOS 7 and I can find neither
> hide nor hair of it.  There is, however, an opcache package one can install
> (php56u-opcache.x86_64 in my case).
>
>
>
> Question 3:
> What about Zend Optimizer? Still other articles say it has been integrated
> into php 5.5 and later, but this mythical beast also makes no sign to
> indicate its inclusion either. Some articles:
> https://wiki.php.net/rfc/optimizerplus
> https://wordpress.org/support/topic/looking-ahead-to-php-55-zend-optimizer-the-end-of-apc
> http://www.internetnews.com/blog/skerner/php-5-5-to-include-open-source-zend-optimizer-.html
>
>
> Seems to me there is currently a lot of confusion surrounding OPCache and
> it should be cleared up.


I think part of your confusion here is over terminology:

- Every module of PHP is referred to as an "extension", however deeply 
embedded it is in the language. The most basic functions you can think 
of, like string and array manipulation, are in "ext/standard" in the source.
- A module being "bundled" means that it is included in the official 
tarball releases on php.net, and indicates a certain guarantee of 
maintenance for compatibility with new versions of PHP.
- Some bundled extensions cannot be disabled, because to do so would 
break too many dependencies. Most can technically be disabled, and/or 
built as separate shared libraries to be enabled in your php.ini as 
desired. In the case of OpCache, it's bundled, but as a shared library.
- The PHP you install on a Linux system will most likely NOT be the 
official tarball, but something put together by your Linux distribution. 
They are under no obligation to handle all bundled extensions the same 
way, or enable them by default. They may for instance install the 
extensions as shared libraries and offer a script to enable/disable 
them, or they may put them all into separate packages which you have to 
install and then configure themselves automatically.
- Oh, and roughly speaking "OpCache" is the name for the open sourced 
version of "ZendOptimizer+", i.e. the version which was made available 
as a PECL download for PHP 5.2, 5.3, and 5.4, and included as a 
"bundled" extension in PHP 5.5 onwards.

This is all a rather long-winded way of saying the same thing Rasmus 
just said, but maybe it will help. :)

Regards,
-- 
Rowan Collins
[IMSoP]