正则表达式/DOM读取xml,php/dom编写xml

<?php
echo "<br/>====================DOM读取xml===========================<br/>";
$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/>=========================================================================<br/>";
?>
<?php
echo "<br/>===================解析器-读取xml===========================<br/>";
$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";
}
echo "<br/>=========================================================================<br/>";
?>

<?php
echo "<br/>=================正则表达式 读取xml===========================<br/>";
$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" );
}
echo "<br/>=========================================================================<br/>";
?>
<?php
echo "<br/>===================清单 5. 用 DOM 编写图书 XML================<br/>";
$books = array();
$books [] = array(
'title' => 'PHP Hacks',
'author' => 'Jack Herrington',
'publisher' => "O'Reilly"
);
$books [] = array(
'title' => 'Podcasting Hacks',
'author' => 'Jack Herrington',
'publisher' => "O'Reilly"
);

$doc = new DOMDocument();
$doc->formatOutput = true;

$r = $doc->createElement( "books" );
$doc->appendChild( $r );

foreach( $books as $book )
{
$b = $doc->createElement( "book" );

$author = $doc->createElement( "author" );
$author->appendChild(
$doc->createTextNode( $book['author'] )
);
$b->appendChild( $author );

$title = $doc->createElement( "title" );
$title->appendChild(
$doc->createTextNode( $book['title'] )
);
$b->appendChild( $title );

$publisher = $doc->createElement( "publisher" );
$publisher->appendChild(
$doc->createTextNode( $book['publisher'] )
);
$b->appendChild( $publisher );

$r->appendChild( $b );
}

echo $doc->saveXML();
?>
<?php
echo "<br/>===================PHP 编写图书 XML================<br/>";
$books = array();
$books [] = array(
'title' => 'PHP Hacks',
'author' => 'Jack Herrington',
'publisher' => "O'Reilly"
);
$books [] = array(
'title' => 'Podcasting Hacks',
'author' => 'Jack Herrington',
'publisher' => "O'Reilly"
);
?>
<books>
<?php

foreach( $books as $book )
{
?>
<book>
<title><?php echo( $book['title'] ); ?></title>
<author><?php echo( $book['author'] ); ?>
</author>
<publisher><?php echo( $book['publisher'] ); ?>
</publisher>
</book>
<?php
}
?>
</books>

books.xml内容如下：

<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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