Sorry if this is the wrong place to add this post.

But I've search everywhere I specific example why I should learn codeigniter when I already know php and Wordpress.

Is there anything that I can add on website using codeigniter that I cannot implement using Wordpress example If I am asked to build exact same site one using wordpress and the other codeigniter what can I do with codeigniter that I wouldnt be able to with Wordpress Backend and Front end??