PHP cdata 处理(详细介绍)

内容摘要

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' // '<' // '<

文章正文

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

 // 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。

代码注释

上一篇浅谈ASP.NET的include的使用方法下一篇详解C++中基类与派生类的转换以及虚基类

作者：喵哥笔记

学的不仅是技术，更是梦想！