Fix mysql Database driver for hhvm

Result.php

<?php

class Database_MySQL_HHVM_Result {

  protected $_ref;

  public function current()
  {
    if ($this->_current_row !== $this->_internal_row AND ! $this->seek($this->_current_row))
      return NULL;

    // Increment internal row for optimization assuming rows are fetched in order
    $this->_internal_row++;

    // Get row as associated array
    $row = mysql_fetch_assoc($this->_result);

    if ($this->_as_object === TRUE OR is_string($this->_as_object))
    {
      if ( ! isset($this->_ref))
      {
        // Create reflection class of given class name or stdClass
        $this->_ref = new ReflectionClass(is_string($this->_as_object) ? $this->_as_object : 'stdClass');
      }
      
      // Get new instance whithout constructing it
      $object = $this->_ref->newInstanceWithoutConstructor();

      foreach ($row as $column => $value)
      {
        // Trigger the setter
        $object->__set($column, $value);
      }

      // Construct the class with no parameter
      $object->__construct(NULL);

      return $object;
    }

    return $row;
  }

}