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Also to know is, is WordPress worth learning in 2020?
Absolutely yes. Its 2019 35% market share of global websites is up from 13% in 2011. More than a *third* of websites are powered by WordPress so of course it's worth learning.
Subsequently, question is, is PHP still worth learning 2019? If you know, 50% of internet websites are built using PHP, hence you cannot ignore the power of PHP. Though it's not on my list of things to learn in 2019, it's still a great programming language to learn and if decide to learn PHP, then PHP for Beginners is a good starting point.
Hereof, do I need to know PHP to use WordPress?
A WordPress user does not need to learn PHP in order to use, run, or manage a WordPress powered website. Most users can use WordPress without ever learning to program or code in PHP.
Is it worth it to learn WordPress?
It is worth learning just like it is worth learning Symfony and Laravel and Zend Framework or any other framework or library. It was a good experience and I learned that I wished other PHP web applications learned from WordPress.