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>
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
以上就是php读取xml文件的方法的实例代码的详细内容。