PHP Fatal error after PHP upgrade (8.0 or higher)

[Castiblanco]

Hi, I am upgrading PHP on this website since we are using PHP 7.4, however, once I go to PHP 8.0+ I get a Fatal error and I see this on the error log:

PHP Fatal error:  Uncaught Error: Undefined constant "ENV" in /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php:1661
Stack trace:
#0 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php(1661): constant('ENV')
#1 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(30): twig_constant('ENV')
#2 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_53e9d8e1532f224322e40f11d9628ced0ef859351326ec40020691e39bf7212b->doDisplay(Array, Array)
#3 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#4 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(84): Twig\Template->display(Array)
#5 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_463bbf3a9ad038b5ee00f4f934eb82c973c950e04f16fdf7b490be87ad3d210b->doDisplay(Array, Array)
#6 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#7 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(35): Twig\Template->display(Array, Array)
#8 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_6117eef2967e4024a8ddd13d22f98637553697006029f77f64e8511beda77b5b->doDisplay(Array, Array)
#9 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#10 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Environment.php(497) : eval()'d code(31): Twig\Template->display(Array)
#11 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(453): __TwigTemplate_1412182097d0a23bc5f170f22c3537c40d9efcdedeb01625fc6e0e9929b2a5d5->doDisplay(Array, Array)
#12 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(420): Twig\Template->displayWithErrorHandling(Array, Array)
#13 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Template.php(432): Twig\Template->display(Array)
#14 /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/TemplateWrapper.php(47): Twig\Template->render(Array, Array)
#15 /dom42117/wp-content/plugins/timber-library/lib/Loader.php(79): Twig\TemplateWrapper->render(Array)
#16 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(334): Timber\Loader->render('page.twig', Array, false, 'default')
#17 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(383): Timber\Timber::compile(Array, Array, false, 'default', true)
#18 /dom42117/wp-content/plugins/timber-library/lib/Timber.php(410): Timber\Timber::fetch(Array, Array, false, 'default')
#19 /dom42117/wp-content/themes/accedian/page.php(70): Timber\Timber::render(Array, Array)
#20 /wordpress-versions/6.1.1/wp-includes/template-loader.php(106): include('/dom42117/wp-co...')
#21 /wordpress-versions/6.1.1/wp-blog-header.php(19): require_once('/wordpress-vers...')
#22 /wordpress-versions/6.1.1/index.php(17): require('/wordpress-vers...')
#23 {main}
  thrown in /dom42117/wp-content/plugins/timber-library/vendor/twig/twig/src/Extension/CoreExtension.php on line 1661

WordPress 6.1.1, PHP 8.0, Timber 1.22.1

Thanks!

[joworeiter]

Timber 1.22 doesn't work with PHP 8.

[Castiblanco]

Timber 1.22 doesn't work with PHP 8.

Is there a workaround? that is the latest version of that plugin https://wordpress.org/plugins/timber-library/ so I wonder if there is a fix or alternative? Thanks!

[joworeiter]

The only way to work with PHP8 and Timber would be to upgrade to Timber 2.0 beta.
But you have to keep in mind, that version 2.0 dropped the plugin support, so you would have to install it directly in your theme, prefered via composer.

[rmens]

Timber 1.22.1 should support PHP 8.0. It was added in 1.21.0 (https://github.com/timber/timber/releases/tag/1.21.0). PHP 8.1 support was removed. The Wordpress plug-in ships Twig 1.44.7 which should have PHP 8 support too. Can you check which Twig version you have installed?

[Levdbas]

Stale + couldn't reproduce for a site that I had still running on the plugin version.