如何正确使用PHP DOM-XML创建XML文件

我们在创建XML文件并对其进行解析时，通常都会用到

PHP DOM-XML的应用代码示例：

1. ?php
2. /**
3. * Topic: Create and parse XML files using PHP DOM-XML
4. * Source:http://www.php.net/domxml
5. * Reference: http://www.zugeschaut-und-mitgebaut.de/php/extension.domxml.html
6. * Author:[e-mail], 16-1-2001
7. *
8. */
9. // 使用PHP DOM-XML创建和解析XML文件
10. //创建XML文档对象；以后的处理过程将在此基础上进行
11. ＄doc = new_xmldoc("1.0" );
12. //创建根节点，并设置一个属性
13. ＄root = ＄doc->add_root("faq" );
14. ＄root->setattr("page", "32" );
15. //子节点
16. ＄one = ＄root->new_child("question", "");
17. //为子节点设置属性
18. ＄one->setattr("number", "1");
19. //question也创建子节点，并且给它赋值
20. ＄one->new_child("text", "1. Where to get libxml-2.0.0?");
21. ＄one->new_child("answer", "You can download the latest
22. release of libxml either as a source archive or
23. RPM package from http://www.xmlsoft.org.
24. The current version is libxml2-2.2.1." );
25. ＄two = ＄root->new_child("question", "" );
26. ＄two->setattr("number", "2");
27. ＄two->new_child("text", "2. How to configure PHP4?" );
28. // 创建一个不直接赋值的节点
29. ＄twoone = ＄two->new_child("answer", "");
30. // 然后给它单独赋值
31. ＄twoone->set_content("DIR is the libxml install directory
32. (if you just use --with-dom it defaults
33. to /usr), I needed to use --with-dom=/usr/local" );
34. ＄three = ＄root->new_child("question", "" );
35. ＄three->setattr("number", "7" );
36. ＄three->new_child("text", "7. How to use DOM XML function ?" );
37. ＄three->new_child("answer", "Read this document source for
38. a simple example." );
39. //输出到Browser
40. print(" pre>".htmlspecialchars(＄doc->dumpmem() )." /pre>" );
41. // write to file
42. //写回到文件
43. ＄fp = fopen("test_dom.xml", "w+" );
44. fwrite(＄fp, ＄doc->dumpmem(), strlen(＄doc->dumpmem() ));
45. fclose(＄fp);
46. //现在使用xpath从XML文档中得到内容
47. ＄doc = xmldoc(join("", file("test_dom.xml")) );
48. ＄ctx = xpath_new_context(＄doc );
49. //所有对象
50. ＄foo = xpath_eval(＄ctx, "//child::*");
51. print_r(＄foo);
52. print(" br/> br/>");
53. //text node 对象
54. ＄foo = xpath_eval(＄ctx, "//text");
55. print_r(＄foo);
56. print(" br/> br/>");
57. // 第一个text node对象
58. ＄foo = xpath_eval(＄ctx, "//text[1]");
59. print_r(＄foo);
60. print(" br/> br/>");
61. // 第二个text node对象
62. ＄foo = xpath_eval(＄ctx, "//text[2]");
63. print_r(＄foo);
64. print(" br/> br/>");
65. // 第三个answer对象
66. ＄foo = xpath_eval(＄ctx, "//answer[3]");
67. print_r(＄foo);
68. print(" br/> br/>");
69. //第三个text node的类型，名称和内容
70. ＄foo = xpath_eval(＄ctx, "//text[3]");
71. ＄tmp = ＄foo->nodeset;
72. print_r(＄tmp);
73. print(" br/>");
74. print(＄tmp[0]->type) . "; ";
75. print(＄tmp[0]->name) . "; ";
76. print(＄tmp[0]->content);
77. ?>

需要说明，PHP DOM-XML只能在PHPPHP4.0.x + linux上运行