当时在网上找了一个CDATA的转换器， 修改之后， 将CDATA标签给过滤掉。如下
复制代码 代码如下:
 // States:
        //
        //     "out"
        //     "<"
        //     "<!"
        //     "<!["
        //     "<![C"
        //     "<![CD"
        //     "<![CDAT"
        //     "<![CDATA"
        //     "in"
        //     "]"
        //     "]]"
        //
        // (Yes, the states a represented by strings.)
        //
        $state = "out";
        $a = str_split($xml);
        $new_xml = "";
        foreach ($a AS $k => $v) {
            // Deal with "state".
            switch ( $state ) {
                case "out":
                    if ( "<" == $v ) {
                        $state = $v;
                    } else {
                        $new_xml .= $v;
                    }
                break;
                case "<":
                    if ( "!" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                 case "<!":
                    if ( "[" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![":
                    if ( "C" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![C":
                    if ( "D" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![CD":
                    if ( "A" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![CDA":
                    if ( "T" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![CDAT":
                    if ( "A" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "<![CDATA":
                    if ( "[" == $v  ) {
                        $cdata = "";
                        $state = "in";
                    } else {
                        $new_xml .= $state . $v;
                        $state = "out";
                    }
                break;
                case "in":
                    if ( "]" == $v ) {
                        $state = $v;
                    } else {
                        $cdata .= $v;
                    }
                break;
                case "]":
                    if (  "]" == $v  ) {
                        $state = $state . $v;
                    } else {
                        $cdata .= $state . $v;
                        $state = "in";
                    }
                break;
                case "]]":
   if (  ">" == $v  ) {
    $new_xml .= htmlentities($cdata);
#       $new_xml.= $cdata;
//                        $new_xml .= str_replace(">",">",
  //                                  str_replace(">","<",
    //                                str_replace(""",""",
      //                              str_replace("&","&",
        //                            $cdata))));
                        $state = "out";
                    } else {
                        $cdata .= $state . $v;
                        $state = "in";
                    }
                break;
            } // switch
        }
        //
        // Return.
        //
            return $new_xml;

最近发现，总是有alert发出来， 说是simplexml解析出错。 发现是原来有xml的数据是<![CDATA[domain[test]]] >. 出现了连续的3个]， 造成上面的解析函数不能处理。 而且这个问题很难修正， 你不知道下次会不会有4， 5个]出现。 所以决定还是将这段解析 的代码换成DOM XML，本身 DOM的处理还是比较简单的， 包含DOMElement, DOMDocument, DOMNodeList, DOMNode几个 component. 对于 DOMNode有nodeValue, nodeType, nodeName的成员函数。 首先先用loadXML将string转化为DOMDocument对像， 再用getElementsByTagName转化为DOMNodeList对像， 再使用->item(0)转化为DOMNOde， 然后就可以使用上面的三种方法了。 对于 <aa color="red">test</aa>这种xml标签， 要使用 attribute函数。