PHP implements method of reading XML format files

This article mainly introduces the method of PHP reading XML format files. It summarizes and analyzes PHP's operating skills for reading, parsing, loading, and traversing XML format files in the form of examples. Friends in need can refer to it

The details are as follows:

books.xml file:

<books>
<book>
<author>Jack Herrington</author>
<title>PHP Hacks</title>
<publisher>O&#39;Reilly</publisher>
</book>
<book>
<author>Jack Herrington</author>
<title>Podcasting Hacks</title>
<publisher>O&#39;Reilly</publisher>
</book>
</books>

1.DOMDocument method

<?php
$doc = new DOMDocument();
$doc->load( &#39;books.xml&#39; );
$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. Use SAX parser to read XML:

<?php
$g_books = array();
$g_elem = null;
function startElement( $parser, $name, $attrs ) 
{
global $g_books, $g_elem;
if ( $name == &#39;BOOK&#39; ) $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 == &#39;AUTHOR&#39; ||
$g_elem == &#39;PUBLISHER&#39; ||
$g_elem == &#39;TITLE&#39; )
{
$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( &#39;books.xml&#39;, &#39;r&#39; );
while( $data = fread( $f, 4096 ) )
{
xml_parse( $parser, $data );
}
xml_parser_free( $parser );
foreach( $g_books as $book )
{
echo $book[&#39;TITLE&#39;]." - ".$book[&#39;AUTHOR&#39;]." - ";
echo $book[&#39;PUBLISHER&#39;]."\n";
}
?>

3. Use regular expression to parse XML:

<?php
$xml = "";
$f = fopen( &#39;books.xml&#39;, &#39;r&#39; );
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. Parse the XML into an array

<?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. Check whether the XML is valid

<?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. Can be used to accurately read 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, &#39;<?xml&#39;) > -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[] = &#39;没有短消息。&#39;;
            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 class="brush:php;toolbar:false">";
print_r($myData);
echo "<hr>";
echo $myData[message];
?>

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