title: Using $this inside static methods and methods called by this method
body: <p>How do I use <code>$this-&gt;var1</code> inside a method that is called from a static method?
  I have this method:</p>
  
  <pre><code>static public function getModuleConfigInputfields(array $data) {
      $fields = new InputfieldWrapper();
      $modules = Wire::getFuel('modules');
      $field = $modules-&gt;get("InputfieldText");
      $field-&gt;attr('name+id', 'apiKey');
      $field-&gt;attr('value', $data['apiKey']);
      $field-&gt;label = "API Key (Developer Key)";
      $field-&gt;description = 'Enter the API key';
      $fields-&gt;append($field);
      $field = $modules-&gt;get("InputfieldSelect");
      $field-&gt;attr('name+id', 'list_id');
      $mailing_lists = self::get_mc_lists();
      foreach($mailing_lists['data'] as $list)
      {
          $field-&gt;addOption($list-&gt;list_name, $list-&gt;list_id); 
      }
      $field-&gt;label = "Mailing list";
      $field-&gt;description = 'Choose a mailing list';
      $fields-&gt;append($field);
      return $fields;
  }
  </code></pre>
  
  <p>And I want to call this method:</p>
  
  <pre><code>public function get_mc_lists()
  {
      $api = new MCAPI($this-&gt;apiKey);
  
      $retval = $api-&gt;lists();
  
      if ($api-&gt;errorCode){
          return array('errorcode' =&gt; $api-&gt;errorCode, 'errormessage' =&gt; $api-&gt;errorMessage);
      } else {
          return array('data' =&gt; $retval['data'], 'total' =&gt; $retval['total']);
      }
  
  }
  </code></pre>
  
  <p>But I am getting this error:</p>
  
  <blockquote>
    <p>Error Using $this when not in object context (line 31</p>
  </blockquote>
  
  <p>Line 31, which is: <code>$api = new MCAPI($this-&gt;apiKey);</code></p>
  
  <p>So how can I fix this, work around this... I am really stuck on this</p>
  
  <p>Thanks in advance!</p>