Try this, is PHP:
<?php
if (isset($_GET['money'])) {
$money = rob_shop($_GET['money']);
echo 'You now have: '.$money.'<br>';
} else {
$money = 100;
echo 'You now have: '.$money.'<br>';
}
echo '<a href="https://stackoverflow.com/questions/27303586/?money=".$money .'">rob a shop</a>';
function rob_shop($money){
$money = $money + 75;
return $money;
}
?>
But the best way to do it is with ajax to avoid refreshing the page.
solved php variable changes when clicked on html link [closed]