title: How to find default value of extend class method
body: <p>i would like to define new class with extends of PDOStatement and in this child class i need override function bindColumn (<a href="http://php.net/manual/en/pdostatement.bindcolumn.php" rel="nofollow noreferrer">PDOStatement::bindColumn</a>) and in this override function call parent::bindColumn(). But i can't find default value for this method. Is there way to find default value in any method which i would like to override? In source code or somewhere? <strong>I need override more function and i would like to find any default value.</strong> Thanks</p>
  
  <pre><code>class myStatement extends PDOStatement
  {
  
      public function bindColumn ($column, &amp;$param, $type = ?, $maxlen = ?, $driverdata = ?)
      {
  
      }
  
  }
  </code></pre>