! Overwriting text files

[Anon]

I have users writing to a file. The filename is create by their username. How can i make it so if the file exists that user has to enter a new username.

[Anon]

Well, there is a function called file_exists(), that checks for the existence of a file...Is that what you're looking for?

Diego

[Anon]

Yea
I tried that
How do u implement it can u give me a exaplme. Here is my code

$file="orders/$username.dat";

//Write to a file

$fp = fopen($file, 'w');

fwrite($fp, $text);

fclose($fp);

How can i see if the username exists before u write it?

Thank you in advance.