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PHP cdata 處理(詳細(xì)介紹)

更新時(shí)間：2013年07月05日 12:54:05 作者：

之前為項(xiàng)目趕進(jìn)度用php 的simplexml來(lái)解析 xml, 當(dāng)時(shí)發(fā)現(xiàn) simplexml不支持<![CDATA標(biāo)簽，所有處于這個(gè)標(biāo)簽內(nèi)的值都沒(méi)有辦法取到

當(dāng)時(shí)在網(wǎng)上找了一個(gè)CDATA的轉(zhuǎn)換器，修改之后，將CDATA標(biāo)簽給過(guò)濾掉。如下

復(fù)制代碼代碼如下:

 // 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;

最近發(fā)現(xiàn)，總是有alert發(fā)出來(lái)，說(shuō)是simplexml解析出錯(cuò)。

發(fā)現(xiàn)是原來(lái)有xml的數(shù)據(jù)是<![CDATA[domain[test]]] >. 出現(xiàn)了連續(xù)的3個(gè)]，造成上面的解析函數(shù)不能處理。

而且這個(gè)問(wèn)題很難修正，你不知道下次會(huì)不會(huì)有4， 5個(gè)]出現(xiàn)。

所以決定還是將這段解析的代碼換成DOM XML，本身 DOM的處理還是比較簡(jiǎn)單的，

包含DOMElement, DOMDocument, DOMNodeList, DOMNode幾個(gè) component.

對(duì)于 DOMNode有nodeValue, nodeType, nodeName的成員函數(shù)。

首先先用loadXML將string轉(zhuǎn)化為DOMDocument對(duì)像，再用getElementsByTagName轉(zhuǎn)化為DOMNodeList對(duì)像，再使用->item(0)轉(zhuǎn)化為DOMNOde，然后就可以使用上面的三種方法了。

對(duì)于 <aa color='red'>test</aa>這種xml標(biāo)簽，要使用 attribute函數(shù)。