php - Store and add value to variables -

i'm new php , wanted make basic slot machine, when winning number equal user number "money" variable (fake money) doesn't add +10. stays @ 50.

i have made if statement , user number generated rand(), $currentvalue = $money + 10; isn't working.

i'm doing wrong, what?

example of if statement:

if($winnr == $usrnr) {     echo 'you won!';     $currentvalue = $money + 10;     }     else {      echo 'oops, try again';      echo '<button onclick="window.location.reload()">try again</button>';      $currentvalue = $money - 10; } 

assuming have way store $money between page calls (i.e. session), here's how save it

if($winnr == $usrnr) {     echo 'you won!';     $money += 10;     }     else {      echo 'oops, try again';      echo '<button onclick="window.location.reload()">try again</button>';      $money -= 10; }