Issue Cannot enable opcache

[John S.]

I cannot enable opcache for PHP 5.5.38, phpinfo() shows

Zend OPcache
Opcode Caching Disabled
Optimization Disabled

I tried three options with no success:

1. Switching opchache On in Domain->PHP Settings
2. Adding PHP directives directly on the same PHP settings page:

opcache.enable=1
opcache.memory_consumption=128
opcache.max_accelerated_files=4000
opcache_revalidate_freq = 240

3. Adding the above directives into php ini files in

/opt/plesk/php/5.5/etc

or

/var/www/vhosts/system/mydomaincom/etc

The same result - opcacne is not enabled and shows as disabled in phpinfo().

Note. Enabling opcache works perfectly find for PHP 7. Why cannot I enable it for PHP 5.5?

What am I doing wrong?

Thanks

 

[IgorG]

Check that in file /opt/plesk/php/5.5/etc/php.d/10-opcache.ini you have:

opcache.enable=1

 

[John S.]

Check that in file /opt/plesk/php/5.5/etc/php.d/10-opcache.ini you have:

opcache.enable=1

Thanks Igor! It is working now!!!

I still cannot enable any installed pecl extensions except for PHP 5.4.45, but it is a different story.

 

[SteveITS]

Check that in file /opt/plesk/php/5.5/etc/php.d/10-opcache.ini you have:

opcache.enable=1

Ah, thanks. We are setting up a new server (created Feb 2019) with a handful of PHP 5.5 sites. Apparently the default in that file is to have it off? I've not edited it. All other versions have it commented out:

# grep opcache.enable= /opt/plesk/php/*/etc/php.d/10-opcache.ini
/opt/plesk/php/5.5/etc/php.d/10-opcache.ini: opcache.enable=0
/opt/plesk/php/5.6/etc/php.d/10-opcache.ini:; opcache.enable=1
/opt/plesk/php/7.1/etc/php.d/10-opcache.ini:; opcache.enable=1
/opt/plesk/php/7.2/etc/php.d/10-opcache.ini:; opcache.enable=1
/opt/plesk/php/7.3/etc/php.d/10-opcache.ini:; opcache.enable=1

# ll /opt/plesk/php/*/etc/php.d/10-opcache.ini
-rw-r--r-- 1 root root 4567 Sep 1 2017 /opt/plesk/php/5.5/etc/php.d/10-opcache.ini
-rw-r--r-- 1 root root 4599 Jan 10 23:10 /opt/plesk/php/5.6/etc/php.d/10-opcache.ini
-rw-r--r-- 1 root root 4829 Mar 10 22:22 /opt/plesk/php/7.1/etc/php.d/10-opcache.ini
-rw-r--r-- 1 root root 4829 Mar 10 23:14 /opt/plesk/php/7.2/etc/php.d/10-opcache.ini
-rw-r--r-- 1 root root 4829 Mar 10 23:14 /opt/plesk/php/7.3/etc/php.d/10-opcache.ini

It looks like commenting out that "opcache.enable=0" line is sufficient to let opcache work in PHP 5.5, if the domain's PHP Settings have it set to On.

 

[IgorG]

@SteveITS Perhaps "opcache.enable=0" is due to the fact that it appeared exactly from PHP version 5.5, where it was an as experimental feature not included by default.
In fact, it is a very bad idea to use such old and EOLed PHP versions for projects.

 

[SteveITS]

@SteveITS bad idea to use such old and EOLed PHP versions for projects.

Yes, it is not my choice. We have been strongly recommending WordPress sites and really any sites move to PHP 7.x but some clients resist change.

 

[IgorG]

some clients resist change.

Soon they will come to you with requests to fix their hacked site.