$file = "data.txt";
if (file_exists ($file)){
try {
if ($readfile = fopen ($file, "r")){
echo "File opened successfully.";
} else {
throw new exception ("Sorry, the file could not be opened.");
}
} catch (exception $e) {
echo $e->getmessage();
}
} else {
echo "File does not exist.";
}
?>