这篇文章主要介绍了php实现的RSS生成类,实例分析了RSS生成类的原理、定义与使用技巧,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了php实现的RSS生成类,分享给大家供大家参考,具体如下：

1. class RSS
2. {
3. var $title;
4. var $link;
5. var $description;
6. var $language = "en-us";
7. var $pubDate;
8. var $items;
9. var $tags;
10. function RSS()
11. {
12. $this->items = array();
13. $this->tags = array();
14. }
15. function addItem($item)
16. {
17. $this->items[] = $item;
18. }
19. function setPubDate($when)
20. {
21. if(strtotime($when) == false)
22. $this->pubDate = date("D, d M Y H:i:s ", $when) . "GMT";
23. else
24. $this->pubDate = date("D, d M Y H:i:s ", strtotime($when)) . "GMT";
25. }
26. function getPubDate()
27. {
28. if(emptyempty($this->pubDate))
29. return date("D, d M Y H:i:s ") . "GMT";
30. else
31. return $this->pubDate;
32. }
33. function addTag($tag, $value)
34. {
35. $this->tags[$tag] = $value;
36. }
37. function out()
38. {
39. $out = $this->header();
40. $out .= "<channel>\n";
41. $out .= "<title>" . $this->title . "</title>\n";
42. $out .= "<link>" . $this->link . "</link>\n";
43. $out .= "<description>" . $this->description . "</description>\n";
44. $out .= "<language>" . $this->language . "</language>\n";
45. $out .= "<pubDate>" . $this->getPubDate() . "</pubDate>\n";
46. foreach($this->tags as $key => $val) $out .= "<$key>$val</$key>\n";
47. foreach($this->items as $item) $out .= $item->out();
48. $out .= "</channel>\n";
49. $out .= $this->footer();
50. $out = str_replace("&", "&amp;", $out);
51. return $out;
52. }
53. function serve($contentType = "application/xml")
54. {
55. $xml = $this->out();
56. header("Content-type: $contentType");
57. echo $xml;
58. }
59. function header()
60. {
61. $out = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
62. $out .= '<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">' . "\n";
63. return $out;
64. }
65. function footer()
66. {
67. return '</rss>';
68. }
69. }
70. class RSSItem
71. {
72. var $title;
73. var $link;
74. var $description;
75. var $pubDate;
76. var $guid;
77. var $tags;
78. var $attachment;
79. var $length;
80. var $mimetype;
81. function RSSItem()
82. {
83. $this->tags = array();
84. }
85. function setPubDate($when)
86. {
87. if(strtotime($when) == false)
88. $this->pubDate = date("D, d M Y H:i:s ", $when) . "GMT";
89. else
90. $this->pubDate = date("D, d M Y H:i:s ", strtotime($when)) . "GMT";
91. }
92. function getPubDate()
93. {
94. if(emptyempty($this->pubDate))
95. return date("D, d M Y H:i:s ") . "GMT";
96. else
97. return $this->pubDate;
98. }
99. function addTag($tag, $value)
100. {
101. $this->tags[$tag] = $value;
102. }
103. function out()
104. {
105. $out .= "<item>\n";
106. $out .= "<title>" . $this->title . "</title>\n";
107. $out .= "<link>" . $this->link . "</link>\n";
108. $out .= "<description>" . $this->description . "</description>\n";
109. $out .= "<pubDate>" . $this->getPubDate() . "</pubDate>\n";
110. if($this->attachment != "")
111. $out .= "<enclosure url='{$this->attachment}' length='{$this->length}' type='{$this->mimetype}' />";
112. if(emptyempty($this->guid)) $this->guid = $this->link;
113. $out .= "<guid>" . $this->guid . "</guid>\n";
114. foreach($this->tags as $key => $val) $out .= "<$key>$val</$key\n>";
115. $out .= "</item>\n";
116. return $out;
117. }
118. function enclosure($url, $mimetype, $length)
119. {
120. $this->attachment = $url;
121. $this->mimetype = $mimetype;
122. $this->length = $length;
123. }
124. }

使用示例如下：

1. $feed = new RSS();
2. $feed->title = "RSS Feed Title";
3. $feed->link = "http://website.com";
4. $feed->description = "Recent articles on your website.";
5. $db->query($query);
6. $result = $db->result;
7. while($row = mysql_fetch_array($result, MYSQL_ASSOC))
8. {
9. $item = new RSSItem();
10. $item->title = $title;
11. $item->link = $link;
12. $item->setPubDate($create_date);
13. $item->description = "<![CDATA[ $html ]]>";
14. $feed->addItem($item);
15. }
16. echo $feed->serve();