使用PHP DOM-XML创建和解析XML文件

使用PHP DOM-XML创建和解析XML文件<?php
 /**
 * Topic: Create and parse XML files using PHP DOM-XML
 * Source: http://www.php.net/domxml
 * Reference: http://www.zugeschaut-und-mitgebaut.de/php/extension.domxml.html
 * Author: urs@circle.ch, 16-1-2001
 *
 */
// 使用PHP DOM-XML创建和解析XML文件

 //创建XML文档对象；以后的处理过程将在此基础上进行
 $doc = new_xmldoc("1.0" );

 //创建根节点，并设置一个属性
 $root = $doc->add_root("faq" );
 $root->setattr("page", "32" );

 //子节点
 $one = $root->new_child("question", "");
 //为子节点设置属性
 $one->setattr("number", "1");
 //question也创建子节点，并且给它赋值
 $one->new_child("text", "1. Where to get libxml-2.0.0?");
 $one->new_child("answer", "You can download the latest
 release of libxml either as a source archive or
 RPM package from http://www.xmlsoft.org.
 The current version is libxml2-2.2.1." );

 $two = $root->new_child("question", "" );
 $two->setattr("number", "2");
 $two->new_child("text", "2. How to configure PHP4?" );
 // 创建一个不直接赋值的节点
 $twoone = $two->new_child("answer", "");
 // 然后给它单独赋值
 $twoone->set_content("DIR is the libxml install directory
 (if you just use --with-dom it defaults
 to /usr), I needed to use --with-dom=/usr/local" );

 $three = $root->new_child("question", "" );
 $three->setattr("number", "7" );
 $three->new_child("text", "7. How to use DOM XML function ?" );
 $three->new_child("answer", "Read this document source for
 a simple example." );

 //输出到Browser
 print("<pre>".htmlspecialchars($doc->dumpmem() )."</pre>" );

 // write to file
 //写回到文件
 $fp = fopen("test_dom.xml", "w+" );
 fwrite($fp, $doc->dumpmem(), strlen($doc->dumpmem() ));
 fclose($fp);

 // ------------------------------------------------------
 //现在使用xpath从XML文档中得到内容

 $doc = xmldoc(join("", file("test_dom.xml")) );
 $ctx = xpath_new_context($doc );

 //所有对象
 $foo = xpath_eval($ctx, "//child::*");
 print_r($foo);
 print(" ");
 //text node 对象
 $foo = xpath_eval($ctx, "//text");
 print_r($foo);
 print(" ");
 // 第一个text node对象
 $foo = xpath_eval($ctx, "//text[1]");
 print_r($foo);
 print(" ");
 // 第二个text node对象
 $foo = xpath_eval($ctx, "//text[2]");
 print_r($foo);
 print(" ");
 // 第三个answer对象
 $foo = xpath_eval($ctx, "//answer[3]");
 print_r($foo);
 print(" ");

 //第三个text node的类型，名称和内容
 $foo = xpath_eval($ctx, "//text[3]");
 $tmp = $foo->nodeset;
 print_r($tmp);
 print(" ");
 print($tmp[0]->type) . "; ";
 print($tmp[0]->name) . "; ";
 print($tmp[0]->content);

?>

需要说明，PHP DOM 只能在PHP PHP4.0.x + linux上运行

PHPDOM类库请到http://www.zend.com/download下载