Originally published at: WordPress header.php, ACF the_field() and PHP 8.1 results in Uncaught Error: Call to undefined function get_field() - Managing WP - All about Managing WordPress
This was a strange one after moving from PHP 7.4 to PHP 8.0. and PHP 8.1 I ran into an issue where the Advanced Custom Fields plugin function the_field() resulted in the following error. Uncaught Error: Call to undefined function get_field() in /var/www/wp-content/themes/theme/header.php:146 The get_field() was in header.php and, as such, should be working, but…