PHP读取XML格式文件的方法总结

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：

在线格式化xml/在线压缩xml：

xml在线压缩/格式化工具：

xml代码在线格式化美化工具：

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。