PHP Warning: PHP Startup: Unable to load dynamic library 'gd.so'... undefined symbol: gdImageCreateFromAvif

Issue

• GD extension to be unavailable, even though the correct settings are in place, and the alt-phpXX-gd package is installed
• The following error appears whenever the GD extension called.
  For example:

  # su -s /bin/bash exampleuser -c "php -v"
  PHP Warning: PHP Startup: Unable to load dynamic library 'gd.so' (tried: /opt/alt/php81/usr/lib64/php/modules/gd.so 
  (/opt/alt/php81/usr/lib64/php/modules/gd.so: undefined symbol: gdImageCreateFromAvif), /opt/alt/php81/usr/lib64/php/modules/gd.so.so 
  (/opt/alt/php81/usr/lib64/php/modules/gd.so.so: cannot open shared object file: No such file or directory)) 
  in Unknown on line 0

  Environment

• CloudLinux OS
• Alt-PHP
• PHP Selector

Solution

1. Update alt-libgd package:

   yum update alt-libgd

2. If the issue persists after the update, update and remount CageFS:

   cagefsctl --force-update && cagefsctl -M

Cause

The alt-phpXX-gd package is updated, but the alt-libgd package remains outdated.  

Useful links

• Bundled PHP extensions
• PHP Selector