how to store to a .txt file with php

[DwarV]

now i have this script:

<?
addslashes ($HTTP_POST_VARS['edit']);
$change = $HTTP_POST_VARS['edit'];

echo "You entered:<BR><BR> $change" ;

$fd = fopen ($file, "r");

fclose ($fd);
?>

it works. but how do i store the information
(coming from a form) in the $file ?

[Quevas]

$fd = fopen ($filePath, "w");
fwrite($fd,$string);
fclose ($fd);

This will write $string into a file.