PHP写的资源下载防盗链类分享

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);

复制代码 代码如下:


<?php
/**
 *
 * 防盗链外部资源下载处理类
 *
 * @link  
 *
 */
class BurglarDow{
 /**
     * 初始许可下载状态
     * @var    allow
     * @access private
     */
 private $allow      =  false;
 /**
     * 初始下载地址
     * @var    dowUrl
     * @access private
     */
 private $dowUrl     =  null;
 /**
     * 初始来路域名
     * @var    RemoteUrl
     * @access private
     */
 private $RemoteUrl  =  null;
 /**
     * 初始许可资源取用域名列表
     * @var    allowUrl
     * @access private
     */
 private $allowUrl   =  array();
 /**
     * 初始转跳地址
     * @var    Location
     * @access private
     */
 private $Location   =  null;

public function __construct($dowUrl,$Location,array $allowUrl){
  // 初始下载地址
  $this->dowUrl   = $dowUrl;
  // 初始许可资源取用域名列表
  $this->allowUrl = $allowUrl;
  // 初始转跳地址
  $this->Location = $Location;

$this->RemoteUrl = @parse_url($_SERVER['HTTP_REFERER']);                                                      // 获取来路域名
  if(!is_array($this->RemoteUrl))
   header("HTTP/1.1 301 Moved Permanently");
   header("Location: ".$this->Location);

if(isset($this->RemoteUrl['host'])){
   if(in_array($this->RemoteUrl['host'],$this->allowUrl)){                                                   // 判断是否来至许可域名
    $this->allow  = true;                                                                                 // 下载许可状态为:真
   }
  }
  unset($this->allowUrl,$this->RemoteUrl);                                                                      // 释放内存变量
 }

/**
  * 防盗链资源下载
  * @access public
  * @return mixed
  */
 public function dow(){
  $FileInfo = get_headers($this->dowUrl,1);                                                                     // 获取远程文件头部信息

if(true === $this->allow){                                                                                    // 判断是否许可下载资源
   //判断配置文件是否存在
   if(is_file('Config.ini')){
    $FileCon = parse_ini_file('Config.ini');
   }else{
    $FileName   =  basename($FileInfo['Content-Location']);
    $FileConStr = "FileName  = {$FileName}\r\nFileUrl   = {$FileInfo['Content-Location']}\r\nFileSize   = {$FileInfo['Content-Length']}";
    $handle = fopen ('Config.ini', "wb");                                                                 // Config.ini文件不存在则创建文件
    if (fwrite ($handle, $FileConStr) == FALSE) {                                                         // 数据写入文件
     echo "File creation failed ...";
    }
    fclose ($handle);                                                                                     // 关闭一个已打开的文件指针
    $FileCon = parse_ini_file('Config.ini');
   }
   if(!empty($$this->dowUrl)){
    $fp = @fopen($$this->dowUrl, "rb");                                                                   // 二进制模式读取文件
    if (!$fp)
      exit("Download a mistake.\n\n");

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