static variable loop not working in WordPress

Try something like this:

function realistic_get_first_embed_video($post_id)
 {
     $post = get_post($post_id);
     $content = do_shortcode(apply_filters('the_content', $post->post_content));
     $embeds = get_media_embedded_in_content($content);
     if (!empty($embeds)) {
         //check what is the first embed containg video tag, youtube or vimeo
         $counter = 0;
         foreach ($embeds as $embed) {
            // Check condition if count is 0 then 
            // it is the first iteration
            if( $counter == 0 ) {
                return '';
            }

             /*
             if (strpos($embed, 'video') || strpos($embed, 'youtube') || strpos($embed, 'vimeo') || strpos($embed, 'dailymotion') || strpos($embed, 'vine') || strpos($embed, 'wordPress.tv') || strpos($embed, 'hulu')) {
                 return $embed;
             }
             */
            $counter = $counter + 1;
         }
     } else {
         //No video embedded found
         return;
     }
 }