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php readfile下载大文件失败的解决方法

2019-07-31 19:48 来源:未知

本文实例讲述了php readfile下载大文件失败的解决方法。分享给大家供大家参考,具体如下:

本文实例讲述了PHP实现的下载远程文件类定义与用法。分享给大家供大家参考,具体如下:

本文实例讲述了PHP实现的文件操作类及文件下载功能。分享给大家供大家参考,具体如下:

大文件有200多M,只下载了200K就提示下载完成,且不报错。

<?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 => $v <br>rn";
    }
  }
  /**
  * 判别用Get方法发送的头的应答结果是否正确
  */
  public function IsGetOK() {
    if( ereg("^2",$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." $httpvrn");
    fputs($this->m_fp,"Host: ".$this->m_host."rn");
    fputs($this->m_fp,"Accept: */*rn");
    fputs($this->m_fp,"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2)rn");
    #HTTP1.1协议必须指定文档结束后关闭链接,否则读取文档时无法使用feof判断结束
    if ($httpv=="HTTP/1.1") {
      fputs($this->m_fp,"Connection: Closernrn");
    } else {
      fputs($this->m_fp,"rn");
    }
    $httpstas = fgets($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://www.ti.com.cn/cn/lit/an/rust020/rust020.pdf"); # 远程文件地址
$file->SaveToBin("rust020.pdf"); # 保存路径及文件名
$file->Close(); # 释放资源
?>

文件操作类:

原因是PHP内存有限制,需要改为按块下载,就是把大文件切块后逐块下载

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<?php
 // Copyright 2005, Lee Babin (lee@thecodeshoppe.com)
 // This code may be used and redistributed without charge
 // under the terms of the GNU General Public
 // License version 2.0 or later -- www.gnu.org
 // Subject to the retention of this copyright
 // and GPL Notice in all copies or derived works
 class cfile {
  //The path to the file we wish to work with.
  protected $thepath;
  //Error messages in the form of constants for ease of use.
  const FOUNDERROR = "Sorry, the file in question does not exist.";
  const PERMERROR = "Sorry, you do not have the proper permissions on this file";
  const OPENERROR = "Sorry, the file in question could not be opened.";
  const CLOSEERROR = "Sorry, the file could not be closed.";
  //The constructor function.
  public function __construct (){
   $num_args = func_num_args();
   if($num_args > 0){
    $args = func_get_args();
    $this->thepath = $args[0];
   }
  }
  //A function to open the file.
  private function openfile ($readorwrite){
    //First, ensure the file exists.
    try {
      if (file_exists ($this->thepath)){
        //Now, we need to see if we are reading or writing or both.
        $proceed = false;
        if ($readorwrite == "r"){
          if (is_readable($this->thepath)){
            $proceed = true;
          }
        } elseif ($readorwrite == "w"){
          if (is_writable($this->thepath)){
            $proceed = true;
          }
        } else {
          if (is_readable($this->thepath) && is_writable($this->thepath)){
            $proceed = true;
          }
        }
        try {
          if ($proceed){
            //We can now attempt to open the file.
            try {
              if ($filepointer = fopen ($this->thepath, $readorwrite)){
                return $filepointer;
              } else {
                throw new exception (self::OPENERROR);
                return false;
              }
            } catch (exception $e) {
              echo $e->getmessage();
            }
          } else {
            throw new exception (self::PERMERROR);
          }
        } catch (exception $e) {
          echo $e->getmessage();
        }
      } else {
        throw new exception (self::FOUNDERROR);
      }
    } catch (exception $e) {
      echo $e->getmessage();
    }
  }
  //A function to close a file.
  function closefile () {
    try {
      if (!fclose ($this->thepath)){
        throw new exception (self::CLOSEERROR);
      }
    } catch (exception $e) {
      echo $e->getmessage();
    }
  }
  //A function to read a file, then return the results of the read in a string.
  public function read () {
    //First, attempt to open the file.
    $filepointer = $this->openfile ("r");
    //Now, return a string with the read data.
    if ($filepointer != false){
      //Then we can read the file.
      return fgets ($filepointer);
    }
    //Lastly, close the file.
    $this->closefile ();
  }
  //A function to write to a file.
  public function write ($towrite) {
    //First, attempt to open the file.
    $filepointer = $this->openfile ("w");
    //Now, return a string with the read data.
    if ($filepointer != false){
      //Then we can read the file.
      return fwrite ($filepointer, $towrite);
    }
    //Lastly, close the file.
    $this->closefile ();
  }
  //A function to append to a file.
  public function append ($toappend) {
    //First, attempt to open the file.
    $filepointer = $this->openfile ("a");
    //Now, return a string with the read data.
    if ($filepointer != false){
      //Then we can read the file.
      return fwrite ($filepointer, $toappend);
    }
    //Lastly, close the file.
    $this->closefile ();
  }
  //A function to set the path to a new file.
  public function setpath ($newpath) {
    $this->thepath = $newpath;
  }
 }
?>



<?php
  $myfile = new cfile ("test.txt");
  //Now, let's try reading it.
  echo $myfile->read();
  //Then let's try writing to the file.
  $myfile->write ("Hello World!");
  //Then, let's try appending.
  $myfile->append ("Hello Again!");
?>
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