How to determine if PHP OPcache is enabled or not?

Question

I am trying to enable opCache on my server (ubuntu 12.04 LTS, running apache 2.4.7 with PHP Version 5.5.10-1+deb.sury.org~precise+1).

Before starting to do anything, I read this highly relevant post which told me that opCache is disabled by default and I have to manually enable it.

I went into php.ini and found that there is no text with opcache.so, also everything related to opcache is commented out. Like this:

[opcache]
; Determines if Zend OPCache is enabled
;opcache.enable=0

; Determines if Zend OPCache is enabled for the CLI version of PHP
;opcache.enable_cli=0

This is ok, because the person told that it is disabled. But when I consult phpinfo(); it shows me the following (and based on my understanding it tells me that opCache is already used).

So is my opcache enabled and used and how can I see/verify it?

Answer 1

Have faith in your phpinfo(), you've got the necessary shared module running or it wouldn't be showing up.

Also, your opcache is indeed enabled, but only for web, not cli. The default for the library is enabled for web so , to disable uncomment the line starting with a semicolon like this:

 opcache.enable=0 

As noted, for command line php use, the default is disabled, to enable it, uncomment and set to 1

 opcache.enable_cli=1

Here is a list of all runtime arguments and there default value for further reference: http://www.php.net/manual/en/opcache.configuration.php

UPDATE: As of 2020, this library may be no longer maintained, see comments below for other possible options.

If you want a cool web monitor page for it (like apc.php does for apc) try this: https://github.com/rlerdorf/opcache-status

Answer 2

For some reason there is a lot of conflicting documentation about PHP OPcache for PHP v5.5 (the version that first supported it), with some web pages saying it is enabled by default and others saying it is compiled, but not enabled, by default.

Going off my memory only, I think I've seen PHP 5.5 and 5.6 installations where OPcache was indeed compiled but not yet enabled. This would explain why default php.ini line shows disabled. The confusion is likely due to the various ways in which PHP can be compiled.

Anyway, for various reasons it seems PHP 7+ pretty much always has OPcache enabled by default, and again, avoiding complex discussions re: compiling.

All that said, the OP question is really for checking if OPcache is enabled or not (only).

To that end, there is a special function opcache_get_status for this, which can accept arrays too. Going forward, this function will probably become more popular as it is more tuned to explaining the OPcache configuration settings than php.ini and can be used in various scripts, etc.

Here's a quick example:

<?php (is_array(opcache_get_status()) ? 'enabled' : 'disabled') ?>

Ref: https://www.digitalocean.com/community/questions/enable-php-5-5-opcache-on-ubuntu-14-04-with-nginx-and-php-fpm?comment=25376

Answer 3

Inside docker container / any linux:

php -i | grep 'opcache.enable'
# or the entire configuration of opcache:
# php -i | grep 'opcache'

Answer 4

As already mentioned, phpinfo() reveals the status of module installation.

However, using OPcache functions you can find more useful statuses and configurations for further debugging.

opcache_get_configuration(): array|false

The above function returns configuration information about the cache instance. You can see for example the set values of opcache.enable and opcache.enable_cli.

opcache_get_status(): array|false

The above function returns state information about the in-memory cache instance. If the OPCache is disabled, this functions returns false.