PHP implements download file function

PHP code to implement the download function, download files from the server to the local:

Public function downloadTemplateAction()

{
define('Z_WEB_ROOT','http://'.$_SERVER[" SERVER_NAME"]); --------host
$file_name = "template.xlsx";
$file_dir = Z_WEB_ROOT."/SITE/public/template/"; -----The directory where the file is located
$file = @ fopen($file_dir . $file_name,"r");
if (!$file) {
echo "File does not exist. ";
} else {
Header("Content-type: application/octet-stream");
Header("Content-Disposition: attachment; filename=" . $file_name);
while (!feof ($file)) {
echo fread($file,50000);
}
fclose ($file);
}

}

Detailed explanation:

The role of Header("Content-type: application/octet-stream"): With this code, the browser can know the file form returned by the server . The role of

Header("Content-Disposition: attachment; filename=".$file_name): tells the browser the name of the file returned.

fclose($file) can output the last remaining data in the buffer to a disk file and release the file pointer and related buffers.

The above has introduced the function of downloading files in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.