PHP-从ftp-500下载60mb文件：内部服务器错误

I have written following php code which should connect to a FTP, goto a folder and download a 60MB file on regular intervals. When i try to run the code it throws a 500 error, is it a problem with server_file

<?
// define some variables
$local_file = 'abc.zip';
$server_file = '/ftproot/abc/abc.zip';
$ftp_server="ftp.abc.biz";
$ftp_user_name="abc";
$ftp_user_pass="mypasssword";

$conn_id = ftp_connect($ftp_server);

// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

// try to download $server_file and save to $local_file
if (ftp_get($conn_id, $local_file, $server_file, FTP_BINARY)) {
    echo "Successfully written to $local_file
";
}
else {
    echo "There was a problem
";
}
// close the connection
ftp_close($conn_id);


?>

500: Internal server error

This error is generated when a script running on the server could not be implemented or permissions are incorrectly assigned for files or directories

Troubleshooting suggestions:

Temporarily disable any rewrite rules by renaming your .htaccess file if it exists.

Ensure that any CGI or Perl scripts have at least .755. permissions.

If trying to run PHP and you get this error, you may have an invalid php.ini in your /cgi-bin, or may be missing your php.dat file in this folder.

.HTACCESS FILE

Options -Indexes

FTP View