PHP file download class code, PHP file download processing class

/*
* Function: File download
*/
/**
* Usage: $download = new Download();
* //Set parameters
* $download->set_file_dir("c:/");
* $download->set_file_name("boot.ini") ;
* $download->set_read_bytes(1024);
* //File download processing operation
* $download->deal_with();
* //Determine whether the file exists
* if($download->is_file_exist ()){
*echo "file_exist";
*}else{
*echo "file_not_exist";
*}
*/
class Download {
private $file = null;//File handle
private $file_dir = "";//The directory where the file is located
private $file_name = "";//File name
private $file_exist = false;//Indicates whether the file exists, the default is not
private $read_bytes = 0;//Number of bytes read from the file
private $mode = "r";//Access type of the file
public function __construct(){
}
< ;p>public function __destruct(){
if(null != $this->file){
fclose($this->file);
}
}
/* *
* File download processing operations
*/ bbs.it-home.org
public function deal_with(){
//Full file path
$file_path = $this->file_dir . $this->file_name;
 //Check if the file exists
if (file_exists($file_path)) {
$this->file_exist = true;
//Open the file
$this-> file = fopen($file_path, $this->mode);
// Input file tag
Header("Content-type: application/octet-stream");
Header(" Accept-Ranges: bytes");
Header("Accept-Length: " . filesize($file_path));
Header("Content-Disposition: attachment; filename=" . $this->file_name);
//Output file content
while(!feof($this->file))
{
$out = fread($this->file, $this->read_bytes);
 if(!get_magic_quotes_gpc())
{
echo $out;
}
else
{
echo stripslashes($out);
}
}
//echo fread($file, filesize($file_dir . $file_name)) ;
}
}
/**
* The return value is true or false, and the value is used to determine whether the file exists
*/
public function is_file_exist(){
return $this->file_exist;
}
* Parameter type is string
*/
public function set_file_dir($file_dir=""){
$this->file_dir = $file_dir;
}
/**
* Parameter type is string
 */
public function set_file_name($file_name=""){
$this->file_name = $file_name;
}
/**
* The parameter type is integer
*/
public function set_read_bytes( $read_bytes=1024){
$this->read_bytes = $read_bytes;
}
}
?>