'; foreach ($arr as $key => $val) { if (is_numeric($val)) { $xml .= "<$key>$val"; } else { $xml .= "<$key>"; } } $xml .= ''; return $xml; } //过滤字符 public function trimString($value){ $ret = null; if (null != $value) { $ret = $value; if (strlen($ret) == 0) { $ret = null; } } return $ret; } }