本文实例总结了PHP读取XML格式文件的方法。分享给大家供大家参考，具体如下：

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];?>

PS：这里再为大家提供几款关于xml操作的在线工具供大家参考使用：

在线XML/JSON互相转换工具：
http://tools.jb51.net/code/xmljson

在线格式化XML/在线压缩XML：
http://tools.jb51.net/code/xmlformat

XML在线压缩/格式化工具：
http://tools.jb51.net/code/xml_format_compress

XML代码在线格式化美化工具：
http://tools.jb51.net/code/xmlcodeformat

更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP针对XML文件操作技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《PHP错误与异常处理方法总结》、《PHP基本语法入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。