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Date: Thu, 5 Mar 2015 09:46:31 -0800
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To: Rowan Collins <rowan.collins@gmail.com>, Rasmus Lerdorf <rasmus@lerdorf.com>
Cc: internals <internals@lists.php.net>
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Subject: Re: [PHP-DEV] Is OpCache enabled by default in php 5.5 and later or not?
From: zardozrocks@gmail.com (j adams)

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Thank you so much for the generous clarity. Personally, I wish this sort of
information was clearly visible in the docs. However, I don't want to
introduce unnecessary complications there. Should I mention this to the
docs team? It might help eliminate some of the speculative/incorrect
information at the top of google search results.

On Thu, Mar 5, 2015 at 9:11 AM, Rowan Collins <rowan.collins@gmail.com>
wrote:

> j adams wrote on 05/03/2015 16:12:
>
>  I don't know if this is a question for the documentation team or not, bu=
t
>> figured I'd start here. There does not appear to be any definitive, clea=
r,
>> 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 =C2=BB
>> 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=3D/full/path/to/opcache.so on non-Windows platforms, and
>> zend_extension=3DC:\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 integrat=
ed
>> 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 an=
d
>> 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 brea=
k
> 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 th=
e
> 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 wa=
y,
> or enable them by default. They may for instance install the extensions a=
s
> shared libraries and offer a script to enable/disable them, or they may p=
ut
> 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]
>
>
>
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