title: How can I call commoly used functions in slim 3 framework?
body: <p>I am building my website in Slim 3 MVC framework.I need to call some commonly used functions for controller (Eg: For Alias of page title I am using a function called <code>function getAlias(){.....}</code>).</p>
  
  <p>Where I have to create those functions? How can I call inside controllers?</p>