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.coll...@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, 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 ยป >> 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] > > > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > >
