probleme de fermeture des { et des ( et des ;

echo do_shortcode( '[sociallocker id="270"]<div><iframe width="95%" height="315px" src="//www.youtube.com/embed/'.$txt[1][0].'?version=3&autoplay=1&controls=0&showinfo=0&hl=fr_FR&rel=0" frameborder="0" allowfullscreen></iframe></div>';

echo <div>'.randomtext('pub') .'</div>[/sociallocker]' );