src/HtmlSelect.php
public function addOption($content, $value = null, $selected = false)
    {
        $this->addChildElement(new HtmlSelectOption($content, $value, $selected));
        return $this;
    }
public function addOption($content, $value = null, $selected = false)
    {
        $this->addChildElement(new HtmlSelectOption($content, $value, $selected));
        return $this;
    }
add select option

@param       string      $content    select option content
@param       string      $value      select option attribute value
@param       bool        $selected   select option attribute selected
@return      HtmlSelect