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copied!<p>There are several errors in your script, which explains why it doesn't work. First, your <code>$response</code> array doesn't seem right. Did you <em>really</em> intend to use variables in place of keys? Try <code>print_r($response);</code> and see if it's really what you want.</p> <p>You can select the nth <code><question/></code> using the array notation (0-based) as in</p> <pre><code>$results->question[$i] </code></pre> <p>Once you get the right question, all you need to do is verify that it does indeed contain the suggested answer with XPath. Then only, you can <a href="http://docs.php.net/manual/en/language.operators.increment.php" rel="nofollow noreferrer">increment</a> the value of <code><responses/></code>. Also, you have to escape special characters such as <code><</code> or <code>"</code>, which would make your XPath query fail.</p> <p>Finally, you can use <code>asXML()</code> to actually save the file (no <code>file_put_contents()</code> needed here.) I assume that your <code>$surveyResults</code> is a typo and that you meant <code>$surveyResultsFile</code>.</p> <pre><code>$response = array( 'sid' => session_id(), 'answers' => array( $_POST['input1'] ) ); $results = simplexml_load_file($surveyResultsFile); foreach ($response['answers'] as $i => $answer) { $title = htmlspecialchars($answer); $a = $results->question[$i]->xpath('answer[title="' . $title . '"]'); if (empty($a)) { echo "No answer '$title' for question $i\n"; continue; } ++$a[0]->responses; } $results->asXML($surveyResultsFile); </code></pre>

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