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HomeBackend DevelopmentPHP TutorialA brief discussion on the function of php fopen to download remote files

As shown below:

//下载附件
function get_file($url, $folder = "./") {  
  set_time_limit (24 * 60 * 60); // 设置超时时间  
  $destination_folder = $folder . '/'; // 文件下载保存目录,默认为当前文件目录  
  if (!is_dir($destination_folder)) { // 判断目录是否存在  
      mkdirs($destination_folder); // 如果没有就建立目录  
  }  
  $newfname = $destination_folder . basename($url); // 取得文件的名称  
  $file = fopen ($url, "rb"); // 远程下载文件,二进制模式  
  if ($file) { // 如果下载成功  
      $newf = fopen ($newfname, "wb"); // 远在文件文件  
    if ($newf) // 如果文件保存成功  
      while (!feof($file)) { // 判断附件写入是否完整  
        fwrite($newf, fread($file, 1024 * 8), 1024 * 8); // 没有写完就继续  
    }  
  }  
  if ($file) {  
    fclose($file); // 关闭远程文件  
  }  
  if ($newf) {  
    fclose($newf); // 关闭本地文件  
  }  
  return true;  
}  
function mkdirs($path , $mode = "0755") {  
  if (!is_dir($path)) { // 判断目录是否存在  
      mkdirs(dirname($path), $mode); // 循环建立目录   
    mkdir($path, $mode); // 建立目录  
  }  
  return true;  
 
}
 
 
 
 
// 使用示例  
echo get_file('xxxxx.pdf');

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