Помогите написать логику PHP

img{max-width:100%;} 
#articles section{width:100%} 
#articles section:nth-child(2n+1)>div{float:right;} 
#articles section:nth-child(2n)>div{float:left;} 
#articles section div.img{width:30%} 
#articles section div.text{width:70%}

<div id="articles"> 
  <section> 
    <div class="img"> 
      <img src="http://psd.by/wp-content/uploads/2011/02/twitterman256.png"> 
    </div> 
    <div class="text"> 
      <h1>Title1</h1> 
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quae dolorum pariatur ipsa ut dicta maxime quisquam incidunt eligendi doloremque earum molestiae dignissimos magni deleniti quaerat accusantium numquam a facilis quibusdam.</p> 
    </div> 
  </section> 
  <section> 
    <div class="img"> 
      <img src="http://fc01.deviantart.net/fs70/f/2011/142/4/c/twitter_icon_by_ariimage-d3gxs23.png"> 
    </div> 
    <div class="text"> 
      <h1>Title2</h1> 
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Impedit error voluptatibus harum dignissimos facilis pariatur sit ipsa porro non quam voluptatum soluta suscipit veritatis laudantium doloremque perferendis veniam corporis vel.</p> 
    </div> 
  </section> 
  <section> 
    <div class="img"> 
      <img src="http://netbu.ru/wp-content/uploads/2012/03/zloi.jpg" alt=""> 
    </div> 
    <div class="text"> 
      <h1>Title3</h1> 
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum non eveniet molestiae ipsum suscipit molestias saepe sit accusantium enim labore quasi dolor quam qui consequuntur quae voluptatum possimus veritatis quidem.</p> 
    </div> 
  </section> 
</div>