This extension is DEPRECATED and REMOVED as of PHP 7.4. What is WDDX – WDDX (Web Distributed Data eXchange) is a programming language, platform and transport-neutral data interchange mechanism designed to pass data between different environments and different computers.
#cd ~<some_user_home>
#git clone https://github.com/php/pecl-text-wddx.git
#cd pecl-text-wddx
#/usr/local/bin/phpize
#./configure
#make
#make install
Enable the extension into php installation like this:
#cd /usr/local/etc/php/
#cat ext-30-wddx.ini
extension=wddx.so
restart php-fpm if needed after this.
Now it’s possible to use www/owncloud with PHP 7.4.
Source: https://www.mysterydata.com/