这篇文章主要介绍了PHP写的资源下载防盗链类分享,需要的朋友可以参考下，这几天在写一个PHP防盗链外部资源下载处理函数，昨天晚上刚完成编写，中间遇到了些问题，这里就不详述了；

以下是自写的简单的PHP防盗链处理类(重新整理编写成类文件，以便后期改进)；代码如下:

1. <?php 
2. /** 
3.  * 
4.  * 防盗链外部资源下载处理类 
5.  * 
6.  * @link   http://phpfensi.com 
7.  * 
8.  */ 
9. class BurglarDow{ 
10.  /** 
11.      * 初始许可下载状态 
12.      * @var    allow 
13.      * @access private 
14.      */ 
15.  private $allow      =  false; 
16.  /** 
17.      * 初始下载地址 
18.      * @var    dowUrl 
19.      * @access private 
20.      */ 
21.  private $dowUrl     =  null; 
22.  /** 
23.      * 初始来路域名 
24.      * @var    RemoteUrl 
25.      * @access private 
26.      */ 
27.  private $RemoteUrl  =  null; 
28.  /** 
29.      * 初始许可资源取用域名列表 
30.      * @var    allowUrl 
31.      * @access private 
32.      */ 
33.  private $allowUrl   =  array(); 
34.  /** 
35.      * 初始转跳地址 
36.      * @var    Location 
37.      * @access private 
38.      */ 
39.  private $Location   =  null; 
40.  public function __construct($dowUrl,$Location,array $allowUrl){ 
41.   // 初始下载地址 
42.   $this->dowUrl   = $dowUrl; 
43.   // 初始许可资源取用域名列表 
44.   $this->allowUrl = $allowUrl; 
45.   // 初始转跳地址 
46.   $this->Location = $Location; 
47.  
48.   $this->RemoteUrl = @parse_url($_SERVER['HTTP_REFERER']);                                                      // 获取来路域名 
49.   if(!is_array($this->RemoteUrl)) 
50.    header("HTTP/1.1 301 Moved Permanently"); 
51.    header("Location: ".$this->Location); 
52.  
53.   if(isset($this->RemoteUrl['host'])){ 
54.    if(in_array($this->RemoteUrl['host'],$this->allowUrl)){                                                   // 判断是否来至许可域名 
55.     $this->allow  = true;                                                                                 // 下载许可状态为：真 
56.    } 
57.   } 
58.   unset($this->allowUrl,$this->RemoteUrl);                                                                      // 释放内存变量 
59.  } 
60.  
61.  /** 
62.   * 防盗链资源下载 
63.   * @access public 
64.   * @return mixed 
65.   */ 
66.  public function dow(){ 
67.   $FileInfo = get_headers($this->dowUrl,1);                                                                     // 获取远程文件头部信息 
68.  
69.   if(true === $this->allow){                                                                                    // 判断是否许可下载资源 
70.    //判断配置文件是否存在 
71.    if(is_file('Config.ini')){ 
72.     $FileCon = parse_ini_file('Config.ini'); 
73.    }else{ 
74.     $FileName   =  basename($FileInfo['Content-Location']); 
75.     $FileConStr = "FileName  = {$FileName}\r\nFileUrl   = {$FileInfo['Content-Location']}\r\nFileSize   = {$FileInfo['Content-Length']}"; 
76.     $handle = fopen ('Config.ini', "wb");                                                                 // Config.ini文件不存在则创建文件 
77.     if (fwrite ($handle, $FileConStr) == FALSE) {                                                         // 数据写入文件 
78.      echo "File creation failed ..."; 
79.     } 
80.     fclose ($handle);                                                                                     // 关闭一个已打开的文件指针 
81.     $FileCon = parse_ini_file('Config.ini'); 
82.    } 
83.    if(!emptyempty($$this->dowUrl)){ 
84.     $fp = @fopen($$this->dowUrl, "rb");                                                                   // 二进制模式读取文件 
85.     if (!$fp) 
86.       exit("Download a mistake.\n\n"); 
87.  
88.     // 输出远程资源 
89.     header("Content-type:text/html;charset=utf-8"); 
90.     header('Content-Description: File Transfer'); 
91.     header('Content-Type: application/octet-stream'); 
92.     header('Content-Disposition: attachment; filename='.$FileCon['FileName']); 
93.     header("Accept-Ranges: bytes"); 
94.     header('Content-Transfer-Encoding: binary'); 
95.     header('Expires: 0'); 
96.     header('Cache-Control:must-revalidate,post-check=0,pre-check=0'); 
97.     header('Pragma: public'); 
98.     header('Content-Length: '.$FileCon['FileSize']); 
99.     while (!feof($fp)){ 
100.      set_time_limit(0);                                                                                 // 设置文件最长执行时间 
101.      echo fread($fp, 1024);                                                                             // 输出文件 
102.      flush();                                                                                           // 输出缓冲 
103.      ob_flush();                                                                                        // 输出缓冲区中的内容 
104.     } 
105.     fclose($fp); 
106.    }else{ 
107.     header("HTTP/1.1 404 Not Found"); 
108.    } 
109.   }else{ 
110.    header("HTTP/1.1 301 Moved Permanently"); 
111.    header("Location: ".$this->Location); 
112.   } 
113.  } 
114. } 
115. // 远程资源地址 
116. $dowUrl = 'http://dldir1.qq.com/qqfile/qq/QQ5.1/10055/QQ5.1.exe'; 
117. // 转跳地址 
118. $Location = 'http://phpfensi.com'; 
119. // 许可来路域名列表 
120. $allowUrl = array( 
121.  'jb51.net', 
122. ); 
123. $BurglarDow = new BurglarDow($dowUrl,$Location,$allowUrl); 
124. $BurglarDow -> dow(); 
125.  

出处：http://www.phpfensi.com/php/20201214/13549.html