In Drupal 8, Admin-Report > Status report > Twig C extension: Not available Enabling the Twig C extension can greatly increase rendering performance. See the installation instructions for more detail.

I installed Twig C Extension, but it's reported to not be enabled.

How do I install and enable the Twig extension for PHP, in Drupal 8?

  • From Drupal 8.2 onwards, this warning message seems to have gone away. As per this thread github.com/twigphp/Twig/issues/1695 discovered below by @Clive, PHP7 performance is excellent even without the C extension. The C extension has not been ported to PHP7 and it's not clear it will ever be. – AdamS Aug 24 '16 at 9:04

This should just work. Make sure to follow http://twig.sensiolabs.org/doc/installation.html#installing-the-c-extension and run the commands from within /path/to/docroot/vendor/twig/twig. Next, you should check again that extension=twig.so exists in your php.ini file and that Apache has been restarted/reloaded.

To confirm that the extension is being loaded, you can run php -c /path/to/php.ini -i | grep twig

  • This answer is deprecated - at least at time of writing, which is day of release of D8.0.0 - the folder structure doesn't exist, or the answer is incorrect. – NikLP Nov 19 '15 at 18:12
  • Path to the vendor dir had changed since the answer was provided. Thanks to @Berdir for updating the answer drupal.stackexchange.com/posts/162813/revisions – anavarre Nov 20 '15 at 8:04
  • Running phpize (from PHP 7.0.1) in vendor/twig/twig fails for me with Cannot find config.m4. And indeed that file is nowhere to be found. What am I missing? – Simon South Dec 18 '15 at 18:16
  • This answer is not true anymore. vendor/twig/twig/ext doesn't exist in the latest Drupal 8 releases. – kiamlaluno Feb 25 '16 at 17:23

In the latest Drupal 8 releases, the vendor/twig/twig/ext directory doesn't exist anymore.

To build the extension, I first globally required Twig, and then compiled the extension.

composer global require twig/twig:~1.0
cd ~/.composer/vendor/twig/twig/ext/twig
phpize
./configure
make
make install

Then, I edited the php.ini file to add a line about the new extension.

extension=twig.so

I ran the command on OS X 10.11. In a different OS, the directory where Composer put the packages globally required could be different.

I am using Drupal 8.0.4, but it could be that previous versions didn't have the ext/twig version already. From the other answers given here, I take that Drupal 8.0.1 already missed the necessary directory.

On OS X 10.11, I got the following error:

PHP Warning: PHP Startup: Unable to load dynamic library '/Applications/DevDesktop/php5_5/ext/twig.so' - dlopen(/Applications/DevDesktop/php5_5/ext/twig.so, 9): no suitable image found.
Did find: /Applications/DevDesktop/php5_5/ext/twig.so: mach-o, but wrong architecture in Unknown on line 0

Following what reported in Compiling PHP extensions on Snow Leopard with XAMPP, I then tried with the following commands.

composer global require twig/twig:~1.0
cd ~/.composer/vendor/twig/twig/ext/twig
phpize
CFLAGS=-m32 CPPFLAGS=-m32 CCASFLAGS=-m32 ./configure
make
make install

After restarting Apache, the Twig extension was listed between the PHP extensions.

screenshot

As of today (February 26, 2016), I was not able to compile the extension for PHP 7.0, since make fails with a warning and a fatal error.

/Applications/DevDesktop/php7_0/include/php/Zend/zend_hash.h:134:15: warning:
fastcall calling convention ignored on variadic function
[-Wignored-attributes]
ZEND_API void ZEND_FASTCALL zend_hash_apply_with_arguments(HashTable *ht...

/Applications/DevDesktop/php7_0/include/php/Zend/zend_portability.h:231:39: note:
expanded from macro 'ZEND_FASTCALL'
# define ZEND_FASTCALL __attribute__((fastcall))

.composer/vendor/twig/twig/ext/twig/twig.c:23:10: fatal error:
'ext/standard/php_smart_str.h' file not found
#include "ext/standard/php_smart_str.h"

  • Looks like they might not be bothering with support for php7: github.com/twigphp/Twig/issues/1695 – Clive Apr 5 '16 at 0:26
  • To clarify Clive's comment "not bothering" is perhaps more "not needed": PHP7 without the C extension is much faster than PHP5 with the extension (figures available in the thread Clive links to). – AdamS Aug 24 '16 at 8:59

I've just setup a Drupal 8.0.1 site

When I cd to /path/to/docroot/vendor/twig/twig and run composer require twig/twig:~1.0

It creates another vendor folder with psr and symphony in it. Like Simon South, if I run phpize in /path/to/docroot/vendor/twig/twig, it can't find config.m4.

I found that if I cd to /path/to/docroot/vendor/twig/twig/vendor and run composer require twig/twig:~1.0 again, it creates another vendor folder which contains another twig folder with the phpize config.m4 file at

/path/to/docroot/vendor/twig/twig/vendor/vendor/twig/twig/ext/twig

I also experimented with cd /path/to/docroot/vendor, and run composer require twig/twig:~1.0, and it create the needed config.m4 at path/to/docroot/vendor/vendor/twig/twig/ext/twig

Both work, but seems awful confusing for a newbie

A Drupal 8.0.2 Step-by-Step Solution derived from ir4georgia's comment.

I have to use "sudo". ymmv.

cd /path/to/docroot/vendor
sudo composer require twig/twig:~1.0

The above command creates a "vendor" sub-directory in the "vendor" directory.

Move the "ext" subdirectory of the vendor subdirectory into the original d8 twig directory:

sudo mv /path/to/docroot/vendor/vendor/twig/twig/ext /path/to/docroot/vendor/twig/twig/

Delete the second vendor directory

sudo rm -r /path/to/docroot/vendor/vendor

cd to the ext/twig directory

cd /path/to/docroot/vendor/twig/twig/ext/twig

Run the installation commands.

sudo phpize
sudo ./configure
sudo make
sudo make install

Add extension=twig.so to php.ini

Restart apache:

sudo apachectl restart

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