php远程下载类分享

本文实例为大家分享了php远程下载类，如下

    <?php 
    /** 
    * 下载远程文件类支持断点续传 
    */
    class HttpDownload { 
    private $m_url = ""; 
    private $m_urlpath = ""; 
    private $m_scheme = "http"; 
    private $m_host = ""; 
    private $m_port = "80"; 
    private $m_user = ""; 
    private $m_pass = ""; 
    private $m_path = "/"; 
    private $m_query = ""; 
    private $m_fp = ""; 
    private $m_error = ""; 
    private $m_httphead = "" ; 
    private $m_html = ""; 

    /** 
    * 初始化 
    */
    public function PrivateInit($url){ 
    $urls = ""; 
    $urls = @parse_url($url); 
    $this->m_url = $url; 
    if(is_array($urls)) { 
    $this->m_host = $urls["host"]; 
    if(!empty($urls["scheme"])) $this->m_scheme = $urls["scheme"]; 
    if(!empty($urls["user"])) $this->m_user = $urls["user"]; 
    if(!empty($urls["pass"])) $this->m_pass = $urls["pass"]; 
    if(!empty($urls["port"])) $this->m_port = $urls["port"]; 
    if(!empty($urls["path"])) $this->m_path = $urls["path"]; 
    $this->m_urlpath = $this->m_path; 
    if(!empty($urls["query"])) { 
    $this->m_query = $urls["query"]; 
    $this->m_urlpath .= "?".$this->m_query; 
    } 
    } 
    } 

    /** 
    * 打开指定网址 
    */
    function OpenUrl($url) { 
    #重设各参数 
    $this->m_url = ""; 
    $this->m_urlpath = ""; 
    $this->m_scheme = "http"; 
    $this->m_host = ""; 
    $this->m_port = "80"; 
    $this->m_user = ""; 
    $this->m_pass = ""; 
    $this->m_path = "/"; 
    $this->m_query = ""; 
    $this->m_error = ""; 
    $this->m_httphead = "" ; 
    $this->m_html = ""; 
    $this->Close(); 
    #初始化系统 
    $this->PrivateInit($url); 
    $this->PrivateStartSession(); 
    } 

    /** 
    * 获得某操作错误的原因 
    */
    public function printError() { 
    echo "错误信息：".$this->m_error; 
    echo "具体返回头：<br>"; 
    foreach($this->m_httphead as $k=>$v) { 
    echo "$k => $v <br>\r\n"; 
    } 
    } 

    /** 
    * 判别用Get方法发送的头的应答结果是否正确 
    */
    public function IsGetOK() { 
    if( ereg("^2",$this->GetHead("http-state")) ) { 
    return true; 
    } else { 
    $this->m_error .= $this->GetHead("http-state")." - ".$this->GetHead("http-describe")."<br>"; 
    return false; 
    } 
    } 

    /** 
    * 看看返回的网页是否是text类型 
    */
    public function IsText() { 
    if (ereg("^2",$this->GetHead("http-state")) && eregi("^text",$this->GetHead("content-type"))) { 
    return true; 
    } else { 
    $this->m_error .= "内容为非文本类型<br>"; 
    return false; 
    } 
    } 
    /** 
    * 判断返回的网页是否是特定的类型 
    */
    public function IsContentType($ctype) { 
    if (ereg("^2",$this->GetHead("http-state")) && $this->GetHead("content-type") == strtolower($ctype)) { 
    return true; 
    } else { 
    $this->m_error .= "类型不对 ".$this->GetHead("content-type")."<br>"; 
    return false; 
    } 
    } 

    /** 
    * 用 HTTP 协议下载文件 
    */
    public function SaveToBin($savefilename) { 
    if (!$this->IsGetOK()) return false; 
    if (@feof($this->m_fp)) { 
    $this->m_error = "连接已经关闭！"; 
    return false; 
    } 
    $fp = fopen($savefilename,"w") or die("写入文件 $savefilename 失败！"); 
    while (!feof($this->m_fp)) { 
    @fwrite($fp,fgets($this->m_fp,256)); 
    } 
    @fclose($this->m_fp); 
    return true; 
    } 

    /** 
    * 保存网页内容为 Text 文件 
    */
    public function SaveToText($savefilename) { 
    if ($this->IsText()) { 
    $this->SaveBinFile($savefilename); 
    } else { 
    return ""; 
    } 
    } 

    /** 
    * 用 HTTP 协议获得一个网页的内容 
    */
    public function GetHtml() { 
    if (!$this->IsText()) return ""; 
    if ($this->m_html!="") return $this->m_html; 
    if (!$this->m_fp||@feof($this->m_fp)) return ""; 
    while(!feof($this->m_fp)) { 
    $this->m_html .= fgets($this->m_fp,256); 
    } 
    @fclose($this->m_fp); 
    return $this->m_html; 
    } 

    /** 
    * 开始 HTTP 会话 
    */
    public function PrivateStartSession() { 
    if (!$this->PrivateOpenHost()) { 
    $this->m_error .= "打开远程主机出错!"; 
    return false; 
    } 
    if ($this->GetHead("http-edition")=="HTTP/1.1") { 
    $httpv = "HTTP/1.1"; 
    } else { 
    $httpv = "HTTP/1.0"; 
    } 
    fputs($this->m_fp,"GET ".$this->m_urlpath." $httpv\r\n"); 
    fputs($this->m_fp,"Host: ".$this->m_host."\r\n"); 
    fputs($this->m_fp,"Accept: */*\r\n"); 
    fputs($this->m_fp,"User-Agent: Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2)\r\n"); 
    #HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束 
    if ($httpv=="HTTP/1.1") { 
    fputs($this->m_fp,"Connection: Close\r\n\r\n"); 
    } else { 
    fputs($this->m_fp,"\r\n"); 
    } 
    $httpstas = fgets($this->m_fp,256); 
    $httpstas = split(" ",$httpstas); 
    $this->m_httphead["http-edition"] = trim($httpstas[0]); 
    $this->m_httphead["http-state"] = trim($httpstas[1]); 
    $this->m_httphead["http-describe"] = ""; 
    for ($i=2;$i<count($httpstas);$i++) { 
    $this->m_httphead["http-describe"] .= " ".trim($httpstas[$i]); 
    } 
    while (!feof($this->m_fp)) { 
    $line = str_replace("\"","",trim(fgets($this->m_fp,256))); 
    if($line == "") break; 
    if (ereg(":",$line)) { 
    $lines = split(":",$line); 
    $this->m_httphead[strtolower(trim($lines[0]))] = trim($lines[1]); 
    } 
    } 
    } 

    /** 
    * 获得一个Http头的值 
    */ 
    public function GetHead($headname) { 
    $headname = strtolower($headname); 
    if (isset($this->m_httphead[$headname])) { 
    return $this->m_httphead[$headname]; 
    } else { 
    return ""; 
    } 
    } 

    /** 
    * 打开连接 
    */
    public function PrivateOpenHost() { 
    if ($this->m_host=="") return false; 
    $this->m_fp = @fsockopen($this->m_host, $this->m_port, &$errno, &$errstr,10); 
    if (!$this->m_fp){ 
    $this->m_error = $errstr; 
    return false; 
    } else { 
    return true; 
    } 
    } 

    /** 
    * 关闭连接 
    */
    public function Close(){ 
    @fclose($this->m_fp); 
    } 
    } 

    #两种使用方法，分别如下： 

    #打开网页 
    $httpdown = new HttpDownload(); 
    $httpdown->OpenUrl("http://www.google.com.hk"); 
    echo $httpdown->GetHtml(); 
    $httpdown->Close(); 


    #下载文件 
    $file = new HttpDownload(); # 实例化类 
    $file->OpenUrl("http://dldir1.qq.com/qqfile/qq/QQ8.2/17724/QQ8.2.exe"); # 远程文件地址 
    $file->SaveToBin("qq.exe"); # 保存路径及文件名 
    $file->Close(); # 释放资源

以上就是本文的全部内容，希望对大家的学习有所帮助。