[英]PHP - Add or Subtract to variable
如何向变量添加或减去指定的数量? 我需要有一个500€
的“钱包”。 现在,如果我按下按钮,则有50/50的机会我可能在500€
之上获得100€
,或者损失100€
。 如果钱包为0
或页面刷新,则应该结束。 (我是初学者)
试试这个简单的代码。
<?php
if($money == ''){
$money = 500; //initial wallet amount
}
$amount = 100;// it will be added or subtracted
$wallet = $_POST['yourwallet']; //actual wallet value
if(isset($wallet)){ //check if form was submitted
if($wallet > 0){ //you can play while the wallet value is > 0
$p = rand(0,99); //probability
if($p > 49){
$money = ($wallet) + ($amount);
echo '<center><b>';
echo 'You won €100';
echo '</center></b></br>';
}else{
$money = ($wallet) - ($amount);
echo '<center><b>';
echo 'You lost €100';
echo '</center></b></br>';
}
}else{ //if wallet gets 0 or less you can't play anymore
echo '<center><b>';
echo 'Sorry, you don't have enough money to play again';
echo '</center></b></br>';
}
}
?>
<html>
<center>
<form method="post">
Your wallet</br>
<input type="text" name="yourwallet" readonly value="<?php echo $money ?>" /> </br>
</br>
<input value="Click me, you could win €100" type="submit">
</form>
</center>
</html>
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