PHP读取XML

books.xml文件：

<books>
<book>
<author>Jack Herrington</author>
<title>PHP Hacks</title>
<publisher>O'Reilly</publisher>
</book>
<book>
<author>Jack Herrington</author>
<title>Podcasting Hacks</title>
<publisher>O'Reilly</publisher>
</book>
</books>

1.DOMDocument方法
<?php
 $doc = new DOMDocument();
 $doc->load( 'books.xml' );
 $books = $doc->getElementsByTagName( "book" );
 foreach( $books as $book )
 {
 $authors = $book->getElementsByTagName( "author" );
 $author = $authors->item(0)->nodeValue;
 
 $publishers = $book->getElementsByTagName( "publisher" );
 $publisher = $publishers->item(0)->nodeValue;
 
 $titles = $book->getElementsByTagName( "title" );
 $title = $titles->item(0)->nodeValue;
 
 echo "$title - $author - $publisher\n";
 echo "<br>";
 }
 ?>

2.用 SAX 解析器读取 XML

<?php
 $g_books = array();
 $g_elem = null;
 
 function startElement( $parser, $name, $attrs ) 
 {
 global $g_books, $g_elem;
 if ( $name == 'BOOK' ) $g_books []= array();
 $g_elem = $name;
 }
 
 function endElement( $parser, $name ) 
 {
 global $g_elem;
 $g_elem = null;
 }
 
 function textData( $parser, $text )
 {
 global $g_books, $g_elem;
 if ( $g_elem == 'AUTHOR' ||
 $g_elem == 'PUBLISHER' ||
 $g_elem == 'TITLE' )
 {
 $g_books[ count( $g_books ) - 1 ][ $g_elem ] = $text;
 }
 }
 
 $parser = xml_parser_create();
 
 xml_set_element_handler( $parser, "startElement", "endElement" );
 xml_set_character_data_handler( $parser, "textData" );
 
 $f = fopen( 'books.xml', 'r' );
 
 while( $data = fread( $f, 4096 ) )
 {
 xml_parse( $parser, $data );
 }
 
 xml_parser_free( $parser );
 
 foreach( $g_books as $book )
 {
 echo $book['TITLE']." - ".$book['AUTHOR']." - ";
 echo $book['PUBLISHER']."\n";
 }
 ?>

3.用正则表达式解析 XML

<?php
 $xml = "";
 $f = fopen( 'books.xml', 'r' );
 while( $data = fread( $f, 4096 ) ) {
     $xml .= $data; 
 }
 fclose( $f );
 
 preg_match_all( "/\<book\>(.*?)\<\/book\>/s", $xml, $bookblocks );
 
 foreach( $bookblocks[1] as $block )
 {
 preg_match_all( "/\<author\>(.*?)\<\/author\>/", $block, $author );
 preg_match_all( "/\<title\>(.*?)\<\/title\>/",   $block, $title );
 preg_match_all( "/\<publisher\>(.*?)\<\/publisher\>/", $block, $publisher );
 echo( $title[1][0]." - ".$author[1][0]." - ".$publisher[1][0]."\n" );
 }
 ?>

4.解析XML到数 组

<?php
     $data = "<root><line /><content language=\"gb2312\">简单的XML数据</content></root>";
     $parser = xml_parser_create();                        //创建解析器
     xml_parse_into_struct($parser, $data, $values, $index);    //解析到数组
     xml_parser_free($parser);                            //释放资源
     
     //显示数组结构
     echo "\n索引数组\n";
     print_r($index);
     echo "\n数据数组\n";
     print_r($values);
 ?>

5.检查XML是否有效

<?php
     //创建XML解析器
     $xml_parser = xml_parser_create();
 
     //使用大小写折叠来保证能在元素数组中找到这些元素名称
     xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, true);
 
     //读取XML文件
     $xmlfile = "bb.xml";
     if (!($fp = fopen($xmlfile, "r")))
     {
         die("无法读取XML文件$xmlfile");
     }
 
     //解析XML文件
     $has_error = false;            //标志位
     while ($data = fread($fp, 4096))
     {
         //循环地读入XML文档，只到文档的EOF，同时停止解析
         if (!xml_parse($xml_parser, $data, feof($fp)))
         {
             $has_error = true;
             break;
         }
     }
 
     if($has_error)
     { 
         echo "该XML文档是错误的！<br />";
 
         //输出错误行，列及其错误信息
         $error_line   = xml_get_current_line_number($xml_parser);
         $error_row   = xml_get_current_column_number($xml_parser);
         $error_string = xml_error_string(xml_get_error_code($xml_parser));
 
         $message = sprintf("［第%d行，%d列］：%s", 
                         $error_line,
                         $error_row,
                         $error_string);
         echo $message;
     }
     else
     {
         echo "该XML文档是结构良好的。";
     }
     
     //关闭XML解析器指针，释放资源
     xml_parser_free($xml_parser);
 ?>
6.可用于精确的读取XML
test.xml
<?xml version="1.0" encoding="UTF-8" ?>
     <SBMP_MO_MESSAGE>
         <CONNECT_ID>100</CONNECT_ID>
         <MO_MESSAGE_ID>123456</MO_MESSAGE_ID>
         <RECEIVE_DATE>20040605</RECEIVE_DATE>
         <RECEIVE_TIME>153020</RECEIVE_TIME>
         <GATEWAY_ID>1</GATEWAY_ID>
         <VALID>1</VALID>
         <CITY_CODE>010</CITY_CODE>
         <CITY_NAME>北京</CITY_NAME>
         <STATE_CODE>010</STATE_CODE>
         <STATE_NAME>北京</STATE_NAME>
         <TP_PID>0</TP_PID>
         <TP_UDHI>0</TP_UDHI>
         <MSISDN>15933626501</MSISDN>
         <MESSAGE_TYPE>8</MESSAGE_TYPE>
         <MESSAGE>5618常年供应苗木，品种有玉兰、黄叶杨等。联系人：张三，电话：1234567890。</MESSAGE>
         <LONG_CODE>100</LONG_CODE>
         <SERVICE_CODE>9588</SERVICE_CODE>
     </SBMP_MO_MESSAGE>
 test.php:
 <?php
 $myData = array();
 $file = file_get_contents("test.xml");
 if(strpos($file, '<?xml') > -1) {
         try {
             //加载解析xml
             $xml = simplexml_load_string($file);
             if($xml) {
                 //echo $this->result;
                 //获取节点值
                 $CONNECT_ID = $xml->CONNECT_ID;
                 $MO_MESSAGE_ID = $xml->MO_MESSAGE_ID;
                 $RECEIVE_DATE = $xml->RECEIVE_DATE;
                 $RECEIVE_TIME = $xml->RECEIVE_TIME;
                 $GATEWAY_ID = $xml->GATEWAY_ID;
                 $VALID = $xml->VALID;
                 $CITY_CODE = $xml->CITY_CODE;
                 $CITY_NAME = $xml->CITY_NAME;
                 $STATE_CODE = $xml->CITY_CODE;
                 $STATE_NAME = $xml->STATE_NAME;
                 $TP_PID = $xml->TP_PID;
                 $TP_UDHI = $xml->TP_UDHI;
                 $MSISDN = $xml->MSISDN;
                 $MESSAGE_TYPE = $xml->MESSAGE_TYPE;
                 $MESSAGE = $xml->MESSAGE;//短信
                 $LONG_CODE = $xml->LONG_CODE;
                 $SERVICE_CODE = $xml->SERVICE_CODE;
                 preg_match("/(561)\d{1,2}/", $MESSAGE, $code);
                 switch($code[0]) {
                     case 5618 :
                         $myData[message] = $MESSAGE;
                         break;
                     default :
                         $myData[] = '没有短消息。';
                         break;
                     }
                     
                 } else {
                     echo "加载xml文件错误。";
                 }
             
         } catch(exception $e){
             print_r($e);
         }
 
 } else {
     echo "没有该XML文件。";
 }
 
 echo "<pre>";
 print_r($myData);
 echo "<hr>";
 echo $myData[message];
 ?>