the find_by_id() method is a statical method but full_name is not so. hence we need to instantiate User class but in that video, he does not instantiate it.
2- The error I faced it :
Fatal error: Call to a member function full_name() on a non-object
I write the script like him but he could run it by i could not. I ask the masters, help me to find my mistake.
meanwhile I attached my script and Kevin's script to this post.
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