/**
* Sets the subtitle of InstantArticle
*
* @param string|H2 $subtitle The subtitle of the InstantArticle
*
* @return $this
*/
public function withSubTitle($subtitle)
{
Type::enforce($subtitle, array(Type::STRING, H2::getClassName()));
if (Type::is($subtitle, Type::STRING)) {
$this->subtitle = H2::create()->appendText($subtitle);
} else {
$this->subtitle = $subtitle;
}
return $this;
}
/**
* The caption sub title. optional.
*
* @param string $sub_title the caption sub title text that will be shown
*
* @return $this
*/
public function withSubTitle($sub_title)
{
Type::enforce($sub_title, [Type::STRING, H2::getClassName()]);
if (Type::is($sub_title, Type::STRING)) {
$sub_title = H2::create()->appendText($sub_title);
}
$this->subTitle = $sub_title;
return $this;
}
/**
* Adds new child elements to the front of this InstantArticle
*
* @param Element to be added to this Article.
*
* @return $this
*/
public function unshiftChild($child)
{
Type::enforce($child, [Ad::getClassName(), Analytics::getClassName(), AnimatedGIF::getClassName(), Audio::getClassName(), Blockquote::getClassName(), Image::getClassName(), H1::getClassName(), H2::getClassName(), Interactive::getClassName(), ListElement::getClassName(), Map::getClassName(), Paragraph::getClassName(), Pullquote::getClassName(), RelatedArticles::getClassName(), Slideshow::getClassName(), SocialEmbed::getClassName(), Video::getClassName()]);
array_unshift($this->children, $child);
return $this;
}
