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：
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<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>
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1.DOMDocument方法
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<?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>";
}
?>
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2.用 SAX 解析器读取 XML：
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<?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";
}
?>
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3.用正则表达式解析 XML：
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<?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" );
}
?>
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4.解析XML到数组
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<?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);
?>
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5.检查XML是否有效
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<?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);
?>
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6.可用于精确的读取XML
test.xml
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<?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>
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test.php:
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<?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];
?>
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希望本文所述对大家PHP程序设计有所帮助。