Unable to load dynamic library '/opt/alt/php56/usr/lib64/php/modules/memcached

Issue

The Memcached module not loading even though it's properly activated from cPanel.

This is the error :

Message: PHP Startup: Unable to load dynamic library '/opt/alt/php56/usr/lib64/php/modules/memcached.so' - /opt/alt/php56/usr/lib64/php/modules/memcached.so: undefined symbol: igbinary_serialize

The issue is happening with this package:

# yum info alt-php56-pecl-ext-1-100.el8.x86_64
This system is receiving updates from CloudLinux Network server.
Last metadata expiration check: 0:13:35 ago on Thu 12 Jan 2023 01:09:59 PM CET.
Installed Packages
Name         : alt-php56-pecl-ext
Version      : 1
Release      : 100.el8
Architecture : x86_64
Size         : 20 M
Source       : alt-php56-pecl-ext-1-100.el8.src.rpm
Repository   : @System
From repo    : cloudlinux-x86_64-server-8
Summary      : PECL is a repository for PHP Extensions, providing a directory of all known extensions and hosting facilities for downloading and development of PHP
             : extensions.
URL          : http://pecl.php.net/
License      : GPL, MIT, PHP
Description  : This package collect some PECL extentions

If downgraded to 1-99, the error is no longer reproduced.

Environment

• cPanel
• ALT-PHP
• CloudLinux OS

Solution

Please update the "pecl-ext" packages for the affected PHP versions (5.3):

yum update alt-php56-pecl-ext

Versions alt-php56-pecl-ext-1-102 and newer shouldn't be affected. 

Cause

The error was linked to a reported bug (ID ALTPHP-1398) present on a specific release - alt-php56-pecl-ext-1-100.