title: Calling a plugin's function from functions.php
body: <p>I am writing some code in the functions.php of my theme, now what I need to do is execute a function from inside another plugin and im wondering if its possible.</p>
  
  <p>The plugin is wooevents pro and the function I need is as follows:</p>
  
  <pre><code>function order_contains_tickets( $order ) {
      // Function code is in here
  }
  </code></pre>
  
  <p>So my code will look something like this</p>
  
  <pre><code>if ( order_contains_tickets( $order ) ) {
      // Execute code
  }
  </code></pre>