XF 2.1 How to use strpos in templates xenforo 2.1

[adeel786]

I want to do something like

1. if featured image present show featured image
2. else if thread first post message contain Media='youtube' tag show bbcode
3. else show website logo
   
   

   <xf:if is="$thread.custom_fields.FeaturedThumbs">
   <img src="/forums/images/thumb_cache/{$thread.thread_id}.jpg" />
   
   <xf:elseif is="{{ strpos($thread.FirstPost.message, 'MEDIA=youtube') !== false }}" />
   <div class="tooltip-content-inner">
   {{ bb_code($thread.FirstPost.message, 'post:thread_preview', $thread.FirstPost, {
   'lightbox': false
   }) }}
   </div>
   <xf:else />
   <img src="websiteLogo" />
   </xf:if>