######### fonks.php #########
function TarihGoster() {
echo time();
}

######### index.php #########
...
$tarihGoster = true;
if($tarihGoster == true) TarihGoster();
...


---------------------------
---------------------------
---------------------------

######### fonks.php #########
function TarihGoster($durum) {
if($tarihGoster == true) echo time();
}

######### index.php #########
...
$tarihGoster = true;
TarihGoster($tarihGoster);
...