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    <p>You can try something like:</p> <pre><code>&lt;?php $bg = array('bg-01.jpg', 'bg-02.jpg', 'bg-03.jpg', 'bg-04.jpg', 'bg-05.jpg', 'bg-06.jpg', 'bg-07.jpg' ); // array of filenames $i = rand(0, count($bg)-1); // generate random number size of the array $selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen ?&gt; </code></pre> <p><strong>CSS (in the head)</strong></p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;style type="text/css"&gt; &lt;!-- body{ background: url(images/&lt;?php echo $selectedBg; ?&gt;) no-repeat; } --&gt; &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;!-- website --&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>Edit (user's comments)</strong></p> <pre><code>&lt;?php $bg = array('bg-01.jpg', 'bg-02.jpg', 'bg-03.jpg', 'bg-04.jpg', 'bg-05.jpg', 'bg-06.jpg', 'bg-07.jpg' ); // array of filenames $i = rand(0, count($bg)-1); // generate random number size of the array $selectedBg = "$bg[$i]"; // set variable equal to which random filename was chosen ?&gt; &lt;html lang="en"&gt; &lt;head&gt; &lt;meta charset=utf-8&gt; &lt;link rel="stylesheet" href="style.css" type="text/css" /&gt; &lt;title&gt;Start Page&lt;/title&gt; &lt;style type="text/css"&gt; &lt;!-- body{ background: url(images/&lt;?php echo $selectedBg; ?&gt;) no-repeat; } --&gt; &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="one"&gt;01 &lt;div class="title"&gt;General&lt;/div&gt; &lt;div class="links"&gt; &lt;a href="google.com"&gt;Google &lt;/a&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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