[PHP] fwrite() - problems....

[Phil Schwarzmann]

I have a large string that I want to written to a new file.
 
Let's say the string contains the characters, "hello!" and I want the
filename to be "hello.txt"
 
Here is the code I have...
 
$filename = "hello.txt";
$outputstring = "hello";
 
fwrite($filename, $outputstring);
 
...and of course it isn't working.  I get this error...
 
Warning: Supplied argument is not a valid File-Handle resource in
/home/filanya/www/biopsy/export.php
 
What am I doing wrong?
 
ThANKS!!