Having an issue with the fopen() php function - php

Question

I have a users directory and a child directory for the login/register system. I have a file, testing.php, to try to figure out how to create a directory in the users directory AND create a PHP file within that same directory. Here's my code:
<?php
$directoryname = "SomeDirectory";
$directory = "../" . $directoryname;
mkdir($directory);
$file = "../" . "ActivationFile";
fopen("$file", "w");
?>
I'm able to get mdkir($directory) to work, but not the fopen("$file", "w").

Answer 1

Try this, this should normally solve your problem.
PHP delivers some functions to manipulate folder & path, it's recommended to use them.
For example to get the current parent folder, you can use dirname function.
$directoryname = dirname(dirname(__FILE__)) . "/SomeDirectory";
if (!is_dir($directoryname)) {
mkdir($directoryname);
}
$file = "ActivationFile";
$handle = fopen($directoryname . '/' . $file, "w");
fputs($handle, 'Your data');
fclose($handle);
This line is equivalent to "../SomeDirectory"
dirname(dirname(__FILE__)) . "/SomeDirectory";
So when you open the file, you open "../SomeDirectory/ActivationFile"
fopen($directoryname . '/' . $file, "w");

Answer 2

You can use the function touch() in order to create a file:
If the file does not exist, it will be created.
You also forgot to re-use $directory when specifying the filepath, so the file was not created in the new directory.
As reported by Fred -ii- in a comment, error reporting should also be enabled. Here is the code with these changes:
<?php
// Enable error output, source: http://php.net/manual/en/function.error-reporting.php#85096
error_reporting(E_ALL);
ini_set("display_errors", 1);
$directoryname = "SomeDirectory";
$directory = "../" . $directoryname;
mkdir($directory);
$file = $directory . "/ActivationFile";
touch($file);

Answer 3

try this:
$dirname = $_POST["DirectoryName"];
$filename = "/folder/{$dirname}/";
if (file_exists($filename)) {
echo "The directory {$dirname} exists";
} else {
mkdir("folder/{$dirname}", 0777);
echo "The directory {$dirname} was successfully created.";
}