PHP file download example code

Use php to implement forced downloading of files, and header functions are often used. Example, php file download example.

class Downfile {
function downserver($file_name){
$file_path = "./img/".$file_name;
//Transcoding, the file name is converted to gb2312 to solve Chinese garbled characters
$file_name = iconv("utf-8","gb2312",$file_name);
$file_path = iconv("utf-8","gb2312",$file_path);
$fp = fopen($file_path," r") or exit("File does not exist");
//Define the size of each download by leaving the variable empty
$buffer = 1024;
//Get the size of the file
$file_size = filesize($file_path);
/ /header("Content-type:text/html;charset=gb2312");
//Will write the four http protocol information used
header("Content-type:application/octet-stream");
header(" Accept-Ranges:bytes");//You can ignore it
header("Content-Length: ".$file_size);//The original text here is Accept-Length. After checking the http protocol, there is no such item
header("Content-Disposition:attachment ;filename=".$file_name);
//Byte counter, records the current number of bytes
$count = 0;
while(!feof($fp) && $file_size-$count>0){
/ /Read $buffer-sized data each time from the file stream opened by $fp
$file_data = fread($fp,$buffer);
$count+=$buffer;
//Read the read data
echo $file_data;
}
//Close the file stream
fclose($fp);
}
}
?>

Call this function to pass in the file name to download the file. Pay attention to modifying $file_path in the above code.