SimpleSAML_Utilities::getDOMText PHP Method

    public static function getDOMText($element)
    {
        return SimpleSAML\Utils\XML::getDOMText($element);
    }

 /**
  * This function parses a KeyDescriptor element. It currently only supports keys with a single
  * X509 certificate.
  *
  * The associative array for a key can contain:
  * - 'encryption': Indicates wheter this key can be used for encryption.
  * - 'signing': Indicates wheter this key can be used for signing.
  * - 'type: The type of the key. 'X509Certificate' is the only key type we support.
  * - 'X509Certificate': The contents of the first X509Certificate element (if the type is 'X509Certificate ').
  *
  * @param $kd  The KeyDescriptor element.
  * @return Associative array describing the key, or NULL if this is an unsupported key.
  */
 private static function parseKeyDescriptor($kd)
 {
     assert('$kd instanceof DOMElement');
     $r = array();
     if ($kd->hasAttribute('use')) {
         $use = $kd->getAttribute('use');
         if ($use === 'encryption') {
             $r['encryption'] = TRUE;
             $r['signing'] = FALSE;
         } elseif ($use === 'signing') {
             $r['encryption'] = FALSE;
             $r['signing'] = TRUE;
         } else {
             throw new Exception('Invalid use-value for KeyDescriptor: ' . $use);
         }
     } else {
         $r['encryption'] = TRUE;
         $r['signing'] = TRUE;
     }
     $keyInfo = SimpleSAML_Utilities::getDOMChildren($kd, 'KeyInfo', '@ds');
     if (count($keyInfo) === 0) {
         throw new Exception('Missing required KeyInfo field for KeyDescriptor.');
     }
     $keyInfo = $keyInfo[0];
     $X509Data = SimpleSAML_Utilities::getDOMChildren($keyInfo, 'X509Data', '@ds');
     if (count($X509Data) === 0) {
         return NULL;
     }
     $X509Data = $X509Data[0];
     $X509Certificate = SimpleSAML_Utilities::getDOMChildren($X509Data, 'X509Certificate', '@ds');
     if (count($X509Certificate) === 0) {
         return NULL;
     }
     $X509Certificate = $X509Certificate[0];
     $r['type'] = 'X509Certificate';
     $r['X509Certificate'] = SimpleSAML_Utilities::getDOMText($X509Certificate);
     return $r;
 }