Innanzitutto grazie per la risposta

Mi dice "Bad Arguments"

Warning: implode(): Bad arguments. in /*****/inc.amat.php on line 8

<?
$txt = implode("", file('write/scrivi.php'));
$filepath = "write/prova.html";
unlink("$filepath");
$fp=fopen($filepath,"a");
fwrite($fp,$txt);
fclose($fp);
?>

Grazie