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copied!<p>Move the PHP code outside the body's id attribute for readability, and use <code>else if</code>. Make sure your code isn't vulnerable to injection by sanitizing or validating input from <code>$_GET</code>. For example:</p> <pre><code><?php function isValidID($x) { return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x); } if (isset($_GET['section']) && isValidID($_GET['section'])) { $bodyID = $_GET['section']; } else if (isset($_GET['page']) && isValidID($_GET['page'])) { $bodyID = $_GET['page']; } else { $bodyID = 'home'; } ?> ... <body id="<?php echo $bodyID; ?>"> </code></pre> <p>Alternatively,</p> <pre><code><?php function isValidID($x) { return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x); } $bodyID='home'; foreach (array('section', 'home') as $key) { if (isset($_GET[$key]) && isValidID($_GET[$key])) { $bodyID = $_GET[$key]; break; } } ?> ... <body id="<?php echo $bodyID; ?>"> </code></pre> <p>In this case, I'd use the first, unrolled version. If you had to check more input keys, use the loop-based approach.</p> <p>If you decide you want both page & section in the ID, you can try something like:</p> <pre><code><?php function isValidID($x) { return preg_match('/^[A-Z][-_.A-Za-z0-9]$/i', $x); } if (isset($_GET['page']) && isValidID($_GET['page'])) { $bodyID = $_GET['page']; } else { $bodyID = 'home'; } if (isset($_GET['section']) && isValidID($_GET['section'])) { $bodyID .= '_' . $_GET['section']; } ?> ... <body id="<?php echo $bodyID; ?>"> </code></pre>

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