webpage response using PHP [closed]

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I have a form structure webpage written in PHP. When information is submitted it gives a unique ID.

Now I want this unique ID to be used in a file. For Example:

$input = "man.id: ".$id;

where $id is the response from the webpage.

$input is present in the same PHP file.

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Here's an example of how to write (append) text to a file with PHP:

$id = GetID(); // GetID can return a value stored on disk that gets incremented
$input = "man.id: " . $id;

$logfile = "mypage.log";
$file = fopen($logfile, 'a'); // Try to open the file in Append mode
if($file) // If the file was opened successfully, i.e. if $file is a valid file pointer
{
  flock($file, LOCK_EX); // Exclusive lock
  fwrite($file, $input);
  fclose($file);
}