Introduction

variables are boxes of memory (think role playing stats)

$player1_health   = 100 ;
$player2_health   = 90 ;
$player1_strength = 10;
$player2_strength = 20;
$player1_dice     = rand(0,6);
$player2_dice     = rand(0,6);

if (player1_health + player1_dice > player2_health + player2_dice)
{
   player2_health = player2 health - 1;
}
else if
if (player2_health + player2_dice > player1_health + player1_dice)
{
   player1_health = player1 health - 1;
}
else
{
echo "It's a draw";
}