<form action="" method="POST"  >

	Misli : <input type="text" name="misli" /> <br />
	Oran : <input type="text" name="oran" /> <br />
	<input type="submit" value="Gonder" name="noname" /> <br />


</form>



<?php


if($_POST){


$_POST['misli'] = str_replace(",",".",$_POST['misli']);
$_POST['oran'] = str_replace(",",".",$_POST['oran']);

$misli = (float)$_POST['misli'];
$oran = (float)$_POST['oran'];

$toplam = $misli*$oran;

echo $toplam;


}