Support » Fixing WordPress » Shortcode for related posts

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    I’m using bellow function for related post shortcode and I have two question about it, first: it’s supposed to display posts with related tag but it doesn’t do that what’s wrong?. Second: how the code should be changed so I can use something like [rps tag=google] and the function just return a post has a tag as “google”?
    This is the code:

    add_shortcode('rps', 'fphp_get_related_posts');
    function fphp_get_related_posts() {
        $reset_post = $post;
        global $post;
        $post_tags = wp_get_post_tags($post->ID);
        if ($post_tags) {
            $post_tag_ids = array();
        foreach($post_tags as $post_tag) $post_tag_ids[] = $post_tag->term_id;
                'tag__in' => $post_tag_ids,
                'post__not_in' => array($post->ID),
                'posts_per_page' => 1,
          		'orderby' => 'rand',
        $related_query = new wp_query( $args );
        if (intval($related_query->post_count) === 0) return '';
        $html = '<div class="rps"><ul><h3>همچنین بخوانید</h3>';
          $html .= '<li style="width:250px">';
          $html .= '<div class="relatedthumb"><a rel="external" href="'. get_the_permalink(). '">';
          $html .= get_the_title() . '</a>';
          $html .= '</div></li>';
      $post = $reset_post;
      $html .= '</ul></div>';
      return $html;
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