PHP FTP 원격으로 파일 삭제

$ftp_server_1="test.net";
$ftp_user_name="test";
$ftp_user_pass="testpwd";

$file = "/home/public_html/test/".$pre_file;

// set up basic connection
$conn_id_1 = ftp_connect($ftp_server_1);

// login with username and password
$login_result_1 = ftp_login($conn_id_1, $ftp_user_name, $ftp_user_pass);

// try to delete $file
@ftp_delete($conn_id_1, $file);

// close the connection
ftp_quit($conn_id_1);