(PHP 4, PHP 5, PHP 7, PHP 8)
ftp_size — Returns the size of the given file
ftp_size() returns the size of the given file in bytes.
Note:
Not all servers support this feature.
Returns the file size on success, or -1 on error.
| Version | Description | 
|---|---|
| 8.1.0 | The ftpparameter expects an FTP\Connection
  instance now; previously, a resource was expected. | 
Example #1 ftp_size() example
<?php
$file = 'somefile.txt';
// set up basic connection
$ftp = ftp_connect($ftp_server);
// login with username and password
$login_result = ftp_login($ftp, $ftp_user_name, $ftp_user_pass);
// get the size of $file
$res = ftp_size($ftp, $file);
if ($res != -1) {
    echo "size of $file is $res bytes";
} else {
    echo "couldn't get the size";
}
// close the connection
ftp_close($ftp);
?>