Drupal 8 Opcache warning (PHP OPcode caching not enabled)

its working for me, thanks

Thank u very much! That worked for me too!

Its working for me.

thank you alot .... i can fix my problem

First of all, thanks a lot for the code krishnakrgupta
The above code does work, but here's my additional findings:

php.ini can be found (on WAMP) by clicking on the wamp icon >> PHP >> php.ini

The code starts at line 1900.
It is not all in one block, but goes as far as 1950.
The lines are not needed to be added, just current code needs modifying.

When you have made these changes remember to save the file AND reset the apache connected with your PHP

It worked for me. 

How to enable OPcache? - To increase site performance

On Ubuntu

Edit the php configuration file at /opt/lampp/etc/php.ini &

server file/etc/php5/apache2/php.ini

• Go to opt/lampp/etc php.ini to enable opcache            

• Open file via terminal   
   -> sudo gedit /opt/lampp/etc/php.in

    if in the case file showing blank
   -> su

    click on enter and give machine password  then add
   -> sudo gedit /opt/lampp/etc/php.ini

  uncomment     (remove colon)

;zend_extension = opache.so 

• now restart lampp
  sudo /opt/lampp/lampp restart

• and check in phpinfo.php . We can see opcache is enabled and showing all the extension related to opcache .   

• To change the value of extension. Then add following lines under “zend-extension = opcahe.so”

                 zend-extension = opcahe.so

                 opcache.memory_consumption=128
                 opcache.max_accelerated_files=2500
                 opcache.interned_strings_buffer=8
                 opcache.revalidate_freq=60
                 opcache.fast_shutdown=1

       - now restart lampp  

          sudo /opt/lampp/lampp restart

   and check in phpinfo.php. We can see all the change. Now we can install Drupal 8.
  Please Refer to Url Ubuntu: http://php.net/manual/en/opcache.installation.php

On Windows

Edit the PHP configuration file at Window 7 C:\Xampp\php\php.ini

   To enable opcache, We have to add following lines

     - Add lines

           zend_extension=php_opcache.dll

         opcache.memory_consumption=128

           opcache.max_accelerated_files=2500
           opcache.interned_strings_buffer=8
           opcache.revalidate_freq=60
           opcache.fast_shutdown=1

 now restart xampp

Please Refer to Url windows: https://commaster.net/content/installing-php-fastcgi-and-zend-opcache-xampp-windows

For another Drupal Trick visite my blog http://toswebdeveloper.blogspot.in/

Thank You krishnakrgupta, it works for me also.

Thanks it's Working :)

zend_extension=opcache.so

;Determines if Zend OPCache in enabled

opcache.enable=1

opcache.memory_consumption=128

opcache.interned_strings_buffer=8

opcache.max_accelerated_files=4000

opcache.revalidate_freq=60

opcache.fast_shutdown=1

It works for me, Thanks!

+1 Thanks it worked

Thanks, It's works for me.

Thanks, It worked for me!

Potential respondents:

Especially for the benefit of day-one Drupal users, and other newbies like me, and because this page is the first drupal.org page from a Google search of 'PHP OPcode caching', I am hoping to get further clarification before I start hacking, to spare myself the all-too-familiar time/torture of trial-and-error Drupal solution attempts. Thanking you in advance from myself, and from the thousands of others who are likely to visit this page.

===

Current PHP version of my webhosting account (on a UNIX server):

I have the option in my webhosting Control Panel to set the version of PHP that is used across the entire account for all sites:

Hosting 'CPanel' > heading "programming" > icon "PHP Config"

Currently is it set on "PHP 5.6 (FastCGI)", and works fine for my Drupal 7 sites, which are each in a separate subfolder of 'public_html'.

I just installed my first Drupal 8.3 site, and it gave the error this page attends to, but I completed the installation anyway, by clicking the text-link reading something similar to, "Continue anyway".

Note to newbies:
When the PHP option is changed in the webhost Control Panel, the files "php.ini", and ".htaccess" in the account's root folder at "public_html/php.ini", and "public_html/.htaccess" are automatically updated (or are created in the rare case they are not existing). Also, a backup copy of the former files (as applicable) are also generated, time-stamped (of sorts, Eg.: ".htaccess.bak.1495181202"), and are placed in the same folder.

Other current webhosting PHP options include:
- "PHP 7.0 [Beta, ..."
- "PHP 7.0 (Single php.ini) [Beta, ..."
- "PHP 7.0 (FastCGI) [Beta, ..."

Because the drupal.org issue "Fully support PHP 7 in Drupal 7" (https://www.drupal.org/node/2656548) is still Not fully resolved, I am hesitant to change my webhost account to using PHP 7 for fear that it will adversely affect my D7 live 'production' sites, particularly since that might be in ways that are not immediately apparent to me.

I vaguely recall reading somewhere that 'OPcode caching' is already suppported in PHP 5.6.

---

Question 1:

Are the code recommendations above intended for sites running PHP 5.6, or for PHP 7.0, or for both?

...assuming that your solutions are designed to correct situations where the PHP configuration, of the version(s) you are targeting, simply does(do) not have 'OPcache' enabled by default. Or can OPcache generally be expected to be enabled by default with PHP 7.0?

Questions 2:

*.dll vs *.so

Am I correct in my assumption that the line of code in the first example above, zend_extension=php_opcache.dll is intended for Windows servers only, and that I should instead use the second example above with the code zend_extension=php_opcache.so given that I am using an online shared webhosting account on a UNIX server? And, as an aside, if you know, is it possible that the *.dll might work for some people using UNIX?

Question 3:

[opcache]

I notice that the first example uses the code [opcache], whereas the second example does not.

Is that 'optional', 'actually required', or 'a problem if included'?

Questions 4:

What php.ini file?

Noting again that each of my D7 and D8 sites are all in separate unique subfolders of 'public_html':

Can your code be used in the existing PHP 5.6 php.ini file at "public_html/php.ini", without fear of it adversely affecting my D7 sites, and without adversely affecting other Drupal administrators who are running additional non-Drupal applications at their webhosts?

Or, does your code need to go into a php.ini file in the root of the D8 site at "[d8-root]/php.ini" (in a php.ini file of our creation, given that the default D8 'completed' installation does not include a php.ini file)?

And if your code can be, or were to be, used in "[d8-root]/php.ini", will it automatically be seen and used, or does the php.ini file then require being linked to by another file, as for example, the "[D8-root]/.htaccess" file?

Questions 5:

Where 'within' existing php.ini file?

Can your code be placed 'anywhere' in an existing 'php.ini' file (if and when it is pre-existing), or does it necessarily have to follow (or precede) certain other specific code declarations that a user may be using in their 'php.ini' file; and if so, what are those specific other code statements to be aware of, and should your solution precede or follow each of those fragments we should 'look out for'?

Question 6:

'Local' considerations

What other considerations, details, and specific instructions might you have for users who are developing 'locally'? ('locally': sites on a computer, instead of online at webhost)

Question 7:

Since I cannot restart my online server, as I have seen recommended/required for 'local' servers, what do I need to do instead, if anything, for my online situation?

Question 8:

On the Drupal 8 "Reports" > "Status report" page ([D8-root]/admin/reports/status) under the heading "Warnings found": "PHP OPcode caching", there is a link to the page "PHP:Installation - Manual" at php.net (http://php.net/manual/en/opcache.installation.php).

On that page under the heading "Recommended php.ini settings", the block of 'recommended' code includes one line at the bottom which is Not in the examples above:

opcache.enable_cli=1

Can anyone who speaks PHP tell us lay-persons the relative benefits of using, vs. not using, that code.

===

Thanking you kindly in advance for your attention, time, patience, and help, and welcoming your answer to even a single question, if that is all you know, or if that is all you have the time for 'registering' and 'answering' here at drupal.org.

Thanks Sprite, you saved me, I did not get the ";" and that's why it did not work for me. I repeat, Thanks!

I am running php 7
verified with the phpinfo and opcache is up and running
the funny/strange thing is that on My MainDomain both wordpress & drupal have problems with the opcache (means cannot access it)
But on an addondomain, which uses the same php.ini, but with a different domainname, opcache is selectable...

EDIT: I got in touch with my hosting provder, they helped me to solve the issue I had.
Apparently a RewriteEngine On in the htaccess was conflicting with opcache
I'll try now different ways to kee the Rewrite code in and keep opcache running.

OKAY: I can confirm now that HTACCESS CAN INTERFERE WITH OPCACHE
in the sense that:
Wordpress uses the htaccess for some Redirects and Rewrites.
If you have other Rewrite Command for your domain, not related to wordpress, they need to go after the wordpress htaccess code.
In my case they were before the wordpress code and this produced that neither drupal nor wordpress could use opcache.
Moved the other rewrites to the end and "Voilà".

In what directory is php.ini in Drupal 8?

Can you please tell me what exactly you see on your phpinfo.php.  We have same issue :( Thanks.