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    <p>Sorry to say, but you have to output valid HTML no matter how much of a pain that is. Best suggestion is to wrap it in a helper function and include it. Or even better, go find a good form handling library and use it. This problem has been solved 1000's of times.</p> <p><strong>XSS CONCERN:</strong> Your example code has a number of security flaws. Let me illustrate a simple way to handle a form cleanly. The following code illustrates an error-proof way to handle:</p> <ul> <li>Reading input</li> <li>Validation</li> <li>Handling errors, with nice messages</li> <li>Re-populating the form</li> <li>Etc...</li> </ul> <p>Please note the use of <code>htmlspecialchars</code> and <code>ENT_QUOTES</code> where needed. Also, the use of the <code>cond ? val1 : val2</code> operator ensures that there are no <code>E_STRICT</code> warnings omitted, without the use of <code>@</code> (which can be terrible for performance).</p> <pre><code>&lt;?php $FirstName = trim(isset($_POST['FirstName']) ? $_POST['FirstName'] : ''); $LastName = trim(isset($_POST['LastName']) ? $_POST['LastName'] : ''); $Gender = trim(isset($_POST['Gender']) ? $_POST['Gender'] : ''); $Action = trim(isset($_POST['Action']) ? $_POST['Action'] : ''); $Errors = array(); switch($Action) { case 'Process': // validation code here if(empty($FirstName)) $Errors[] = 'First Name is required.'; if(empty($LastName)) $Errors[] = 'Last Name is required.'; if($Gender != 'Male' and $Gender != 'Female') $Errors[] = 'Gender is required.'; if(count($Errors) &gt; 0) $break; // save data or whatever here // Redirect to next page header('Location: nextpage.php'); exit; } ?&gt; &lt;html&gt; &lt;head&gt; ... &lt;/head&gt; &lt;body&gt; &lt;?php if(count($Errors) &gt; 0) { ?&gt; &lt;div class="error"&gt; &lt;?php foreach($Error as $e) { ?&gt; &lt;p&gt;&lt;?php echo htmlspecialchars($e); ?&gt;&lt;/p&gt; &lt;?php } ?&gt; &lt;/div&gt; &lt;?php } ?&gt; &lt;form method="post" action="&lt;?php echo htmlspecialchars($_SERVER['REQUEST_URI'], ENT_QUOTES); ?&gt;"&gt; &lt;p&gt; First Name: &lt;input type="text" name="FirstName" value="&lt;?php echo htmlspecialchars($FirstName, ENT_QUOTES); ?&gt;" /&gt; &lt;/p&gt; &lt;p&gt; Last Name: &lt;input type="text" name="LastName" value="&lt;?php echo htmlspecialchars($LastName, ENT_QUOTES); ?&gt;" /&gt; &lt;/p&gt; &lt;p&gt; Gender: &lt;select name="Gender"&gt; &lt;option value=""&gt;&lt;/option&gt; &lt;option value="Male" &lt;?php if($Gender == 'Male') echo 'selected="selected"'; ?&gt;&gt;Male&lt;/option&gt; &lt;option value="Female" &lt;?php if($Gender == 'Female') echo 'selected="selected"'; ?&gt;&gt;Female&lt;/option&gt; &lt;/select&gt; &lt;/p&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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