php教程.应用实例7

php实现文件安全下载 程序如下:   $file_name = “info_check.exe”;   $file_dir = “/public/www/download/”;   if (!file_exists($file_dir . $file_name)) { //检查文件是否存在   echo “文件找不到”;   exit;   } else {   $file = fopen($file_dir . $file_name,”r”); //打开文件   //输入文件标签   header(“content-type: application/octet-stream”);   header(“accept-ranges: bytes”);   header(“accept-length: “.filesize($file_dir . $file_name));   header(“content-disposition: attachment; filename=” . $file_name);   //输出文件内容   echo fread($file,filesize($file_dir . $file_name));   fclose($file);   exit;}   而如果文件路径是”http”或者”ftp”网址的话,则源代码会有少许改变,程序如下:   $file_name = “info_check.exe”;   $file_dir = “www.easycn.net/”;   $file = @ fopen($file_dir . $file_name,”r”);   if (!$file) {   echo “文件找不到”;   } else {   header(“content-type: application/octet-stream”);   header(“content-disposition: attachment; filename=” . $file_name);   while (!feof ($file)) {   echo fread($file,50000);   }   fclose ($file);   }   这样就可以用php直接输出文件了

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