lib/Tumblr/API/Client.php
public function getTaggedPosts($tag, $options = null)
    {
        if (!$options) {
            $options = array();
        }
        $options['tag'] = $tag;

        return $this->getRequest('v2/tagged', $options, true);
    }
public function getTaggedPosts($tag, $options = null)
    {
        if (!$options) {
            $options = array();
        }
        $options['tag'] = $tag;

        return $this->getRequest('v2/tagged', $options, true);
    }
Get tagged posts

@param string $tag     the tag to look up
@param array  $options the options for the call

@return array the response array