Edit XML in HTML form and submit to self

<?php
$xmlUri      = '/some/path/to/your.xml';
$xslUri      = '/some/path/to/your.xsl';
$xmlDocument = new DOMDocument;
$xslDocument = new DOMDocument;

if ($xmlDocument->load($xmlUri) && $xslDocument->load($xslUri)) {

    $xsltProc = new XSLTProcessor();
    $xsltProc->setParam('php-file', htmlspecialchars($_SERVER['PHP_SELF']));
    if ($xsltProc->importStyleSheet($xslDocument)) {
        echo $xsltProc->transformToXML($xmlDocument);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:param name="php-file"/>
  <xsl:template match="/">
    <h2>My data</h2>
    <form action="{$php-file}" method="post">
      <table border="1">
        <tr bgcolor="#9acd32">
          <th style="text-align:left">Title</th>
          <th style="text-align:left">Date</th>
        </tr>
        <xsl:for-each select="events/event">
          <tr>
            <td>Title: <input type="text" id="title" name="title" value="{title}"></input></td>
            <td>Date: <input type="text" id="date" name="date" value="{date}"></input></td>
          </tr>
        </xsl:for-each>
        <tr><td></td><td><input type="submit" value="Submit"/></td></tr>
      </table>
    </form>
  </xsl:template>
</xsl:stylesheet>