title: Creating a Variable of Function from Text using $$
body: <p>I was thinking today at how all the OOP works.</p>
  
  <p>And i was thinking: Wouldn't be great to check if a method exists using a given text value ?</p>
  
  <p>So, if i have a text function_name_in_text_format, how do i check if the method function_name_in_text_format exists ?</p>
  
  <p>I heard of a solution, something with using $$, but could not find real examples</p>