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标题 php远程下载类分享
范文
    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。
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更新时间：2025/5/22 11:09:55