php读取xml文件的三种实现方法

作者：袖梨 2022-06-24

代码如下

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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";
}
?>

正则解析

代码如下

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$xml = "";
$f = fopen( 'books.xml', 'r' );
while( $data = fread( $f, 4096 ) ) { $xml .= $data; }
fclose( $f );

preg_match_all( "//(.*?)//s",
$xml, $bookblocks );

foreach( $bookblocks[1] as $block )
{
preg_match_all( "//(.*?)//",
$block, $author );
preg_match_all( "//(.*?)/<//title/>/", $block, $title ); preg_match_all( "//<publisher/>(.*?)/<//publisher/>/", $block, $publisher ); echo( $title[1][0]." - ".$author[1][0]." - ". $publisher[1][0]."/n" ); } ?></td> </tr> </table> books.xml文件如下 <table width="620" align="center" border="0" cellpadding="1" cellspacing="1" style="background:#FB7"> <tr> <td width="464" height="27" bgcolor="#FFE7CE"> 代码如下</td> <td width="109" align="center" bgcolor="#FFE7CE" style="cursor:pointer;" onClick="doCopy('copy3781')">复制代码</td> </tr> <tr> <td height="auto" colspan="2" valign="top" bgcolor="#FFFFFF" style="padding:10px;" class="copyclass" id=copy3781><books> <book> <author>Jack Herrington</author> <title>PHP Hacks
O'Reilly

Jack Herrington
Podcasting Hacks
O'Reilly

下面就给大家举一个小小的例子用parser函数来读取xml数据：

代码如下

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$parser = xml_parser_create(); //创建一个parser编辑器
xml_set_element_handler($parser, "startElement", "endElement");//设立标签触发时的相应函数这里分别为startElement和endElenment
xml_set_character_data_handler($parser, "characterData");//设立数据读取时的相应函数
$xml_file="1.xml";//指定所要读取的xml文件,可以是url
$filehandler = fopen($xml_file, "r");//打开文件

while ($data = fread($filehandler, 4096))
{
xml_parse($parser, $data, feof($filehandler));
}//每次取出4096个字节进行处理

fclose($filehandler);
xml_parser_free($parser);//关闭和释放parser解析器

$name=false;
$position=false;
function startElement($parser_instance, $element_name, $attrs)        //起始标签事件的函数
{
   global $name,$position;
   if($element_name=="NAME")
   {
   $name=true;
   $position=false;
   echo "名字:";
}
if($element_name=="POSITION")
   {$name=false;
   $position=true;
   echo "职位:";
}
}

function characterData($parser_instance, $xml_data)                  //读取数据时的函数
{
   global $name,$position;
   if($position)
    echo $xml_data."
";
    if($name)
     echo $xml_data."
";
}

function endElement($parser_instance, $element_name) //结束标签事件的函数
{
global $name,$position;
$name=false;
$position=false;
}

xml文件代码如下：