fixate/pw-mvc-boilerplate

<?php
/**
 * Trait for Twitter cards - similar to the Open Graph protocol.
 */
trait Twitter
{
    public static function __twInitialize($obj)
    {
        $obj->helper('twitter_meta_tags');
    }

    private $__tw_opts = array(
        'card' => 'summary',
        'site' => false,
        'creator' => false,
    );

    private $__tw_custom_tags = [];

    protected function tw_get_handle()
    {
        return $this->__tw_get_handle();
    }

    protected function tw_set_opt($opt, $value)
    {
        $this->__tw_opts[$opt] = $value;
    }

    protected function tw_add_tag($tag, $value)
    {
        $this->__tw_custom_tags[$tag] = $value;
    }

    public function twitter_meta_tags()
    {
        $this->__tw_opts['handle'] = $this->__tw_get_handle();

        $tags = array(
            'card' => $this->__tw_opts['card'],
            'site' => $this->__tw_opts['site'] ? $this->__tw_opts['site'] : $this->__tw_opts['handle'],
            'creator' => $this->__tw_opts['creator'] ? $this->__tw_opts['creator'] : $this->__tw_opts['handle'],
        );

        $tags = array_merge($tags, $this->__tw_custom_tags);

        return $this->__tw_render_tags($tags);
    }

    // user should provide full url to twitter account
    private function __tw_get_handle()
    {
        $url = $this->pages->get('/settings')->account_twitter;
        $regex = "|https?://(www\.)?twitter\.com/(#!)?@?([^/]*)|";

        preg_match($regex, $url, $matches);

        if (!empty($matches) && !empty($matches[3])) {
            return '@'.$matches[3];
        }

        return;
    }

    private function __tw_render_tags($tags)
    {
        $html = '';
        foreach ($tags as $name => $value) {
            if ($value !== null) {
                $html .= $this->__tw_tag_markup($name, $value);
            }
        }

        return $html;
    }

    private function __tw_tag_markup($name, $value)
    {
        return "<meta property='twitter:{$name}' content='{$value}'/>";
    }
}