PHP :- Random number Generation

<?php
$rand = rand();
$max = getrandmax();
echo $rand.'/'.$max ;// to get random number with index
echo '<br>';
echo $rand ; // get random number
$rand1= rand(1,6);//to get random number between specified range
echo '<br>' ;
echo $rand1;
// code for form to respond
if (isset ($_POST['roll the dice'] ) ) //call name of input and display result
{
echo "you rolled a dice " .$rand;
}
?>
<form action ="Random number.php" method ="POST">
<input type = "submit" name =" roll the dice" value ="Roll dice">
</form>