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標題: php 文件下載源碼 [打印本頁]

作者: haoren 時間: 2015-9-14 20:39
標題: php 文件下載源碼
下載文件的方法：
實列一：
<?php
      header("Content-Type: text/html;charset=utf-8");

      $file_name ="jdao.png";

      //使用相對路徑
      // $file_path = "./pic/".$file_name;

      // 使用絕對路徑，下載速度要更快些
      $file_path = $_SERVER['DOCUMENT_ROOT']."/pic/".$file_name;

      if(!file_exists($file_path)){
      echo "文件不存在";
      return;
      }

      $fp = fopen($file_path,"r");
      $file_size = filesize($file_path);
      //echo $file_size;

      header("Content-Type: application/octet-stream");  //返回為文件形式
      header("Accept-Ranges: bytes");
      header("Accept-Length: $file_size");
      header("Content-Disposition: attachment; filecolor:#c82829">$file_name); //彈出下載對話框

      //向客戶端發送數據

      $buffer = 1024;
      $file_count =0;
      while((!feof($fp)) && ($file_size - $file_count >0)){
         $file_data = fread($fp,$buffer);
         $file_count += $buffer;
         //把數據回送給瀏覽器
         echo $file_data;

      }

      fclose($fp);

      // echo $file_path; 這句話不能放在下載前，否則就執行不了下載

?>

實例2：
為了兼容中文文件名不出現亂碼，并做成函數源碼如下：

<?php
//首行前不能空出
//文件下載參數說明
//$file_name: 下載文件名
//$file_sub_path: 子文件夾路徑

function fileDown($file_name,$file_sub_path){

   //$file_name = iconv("utf-8","gb2312",$file_name); //IGNORE

   $file_path =  $_SERVER['DOCUMENT_ROOT'].$file_sub_path .$file_name;

   if(!file_exists($file_path)){
      echo "文件不存在";
      return;
      }

      $fp = fopen($file_path,"r");
      $file_size = filesize($file_path);

      //下載文件的頭部分
      header("Content-Type: application/octet-stream");  //返回為文件形式
      header("Accept-Ranges: bytes");
      header("Accept-Length: $file_size");

   //header("Content-Disposition: attachment; filewidth:14px;color:#8e908c">彈出下載對話框

   //以下為了兼容中文文件名在不同瀏覽器中顯示而做如下修改
      $ua = $_SERVER["HTTP_USER_AGENT"];
      $encoded_filename = urlencode($file_name);
      $encoded_filename = str_replace("+", "%20", $encoded_filename);
      header('Content-Type: application/octet-stream');
      if (preg_match("/MSIE/", $ua)) {
      header('Content-Disposition: attachment; filecolor:#c82829">$encoded_filename . '"');
      } else if (preg_match("/Firefox/", $ua)) {
      header('Content-Disposition: attachment; filename*="utf8\'\'' . $file_name . '"');
      } else {
      header('Content-Disposition: attachment; filecolor:#c82829">$file_name . '"');
      }

      $buffer = 11024;
      $file_count = 0;
      while((!feof($fp)) && ($file_size - $file_count > 0)){

         $file_data = fread($fp,$buffer);
         $file_count += $buffer;

         //把數據回送給瀏覽器
         echo $file_data;

      }

      fclose($fp);
  }

fileDown("電腦圖片.jpg","/pic/");

?>

測試文件下載
測試中文文件下載

將文件下載封裝在類文件里filedown.class.php，源碼如下
<?php
class filedown{
            protected $file_name;
            public $file_sub_path;

            function __construct($file_name,$file_sub_path){
               $this->file_name = $file_name;
               $this->file_sub_path = $file_sub_path;
            }

            function fileDown(){

               //$file_name = iconv("utf-8","gb2312",$file_name); //IGNORE

               $file_path =  $_SERVER['DOCUMENT_ROOT'].$this->file_sub_path .$this->file_name;

               if(!file_exists($file_path)){
                  echo "文件不存在";
                  return;
                  }

                  $fp = fopen($file_path,"r");
                  $file_size = filesize($file_path);

                  //下載文件的頭部分
                  header("Content-Type: application/octet-stream");  //返回為文件形式
                  header("Accept-Ranges: bytes");
                  header("Accept-Length: $file_size");

               //header("Content-Disposition: attachment; filewidth:14px;color:#8e908c">彈出下載對話框

               //以下為了兼容中文文件名在不同瀏覽器中顯示而修改的
                  $ua = $_SERVER["HTTP_USER_AGENT"];
                  $encoded_filename = urlencode($this->file_name);
                  $encoded_filename = str_replace("+", "%20", $encoded_filename);
                  header('Content-Type: application/octet-stream');
                  if (preg_match("/MSIE/", $ua)) {
                  header('Content-Disposition: attachment; filecolor:#c82829">$encoded_filename . '"');
                  } else if (preg_match("/Firefox/", $ua)) {
                  header('Content-Disposition: attachment; filename*="utf8\'\'' . $this->file_name . '"');
                  } else {
                  header('Content-Disposition: attachment; filecolor:#c82829">$this->file_name . '"');
                  }

                  $buffer = 11024;
                  $file_count = 0;
                  while((!feof($fp)) && ($file_size - $file_count > 0)){

                     $file_data = fread($fp,$buffer);
                     $file_count += $buffer;

                     //把數據回送給瀏覽器
                     echo $file_data;

                  }

                  fclose($fp);
            }

}

//  $file1 = new filedown("電腦圖片.jpg","/pic/");
// $file1->filedown();

?>

演示多文件下載

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