如何使用php代码和目录路径在服务器上创建.dat文件

我想在我的服务器cpanel上创建一个.dat文件，并希望该文件上传到我的服务器上的"data_files"文件夹中。这是我创建的代码，

<?php
$a = "H";
$b = "Z01284001";
$c = "             ";
$e = "20181122";
$d = "                                        ";
$f = "E72402";
$k = "                 ";
$g = "Sabah Care Specialist CliLot 9, Lintas Jaya Uptown";
$l = "                                                        ";
$h = "PRN";
$m = "                                                     ";
$n = "D";
$o = "EPFLX20";
$p = "             ";
$q = "S";
$r = "                          ";
$s = "000002780000020000000000000";
$t = "                                                                                                                                                                                  ";
$u = "T";
$v = "                                                                                                                                                                                                                                                               ";
$file = fopen("/abc/ced/dat_files/testing.dat","w");
fwrite($file,"$a$b$c$e$d$f$k$g$l$h$mn$n$o$p$q$r$s$tn$u$v");
fclose($file);
echo "File created successfully!";
?>

请帮帮我。