php读取xml文件的三种实现方法

2024-05-04 21:58:38

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文章介绍了三种方式来读取xml文件分别是new DOMDocument(),正则解析xml,用parser函数来读取xml数据,这些方法都是可行的,但第一种和最后一种要好一些.

new DOMDocument()实例代码如下:

<?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:

<?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" );

  }

  ?>

books.xml文件如下:

<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>

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:

<?php

$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."<br>";

    if($name)

     echo $xml_data."<br>";

}

//开源代码Vevb.com

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:

<?xml version="1.0"?>

<employees>

<employee>

<name>张三</name>

<position age="45">经理</position>

</employee>

<employees>

<employee>

<name>李四</name>

<position age="45">助理</position>

</employee>

</employees>