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。，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 - $publishern";
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);
?>

								 
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