[英]Random weighted coin flip in php
I am trying to make a coin flip algorithm in php that is weighted based on the amount gambled on the coin flip.我正在尝试在 php 中创建一个硬币翻转算法,该算法根据硬币翻转的赌注金额加权。
For example, I want a user who has a higher wager to have a lower chance of winning.例如,我希望下注较高的用户获胜的机会较低。 With a wager of 1 being a 50/50 chance, but anything more slowly becoming less and less likely to win.
下注 1 是 50/50 的机会,但任何事情都会慢慢变得越来越不可能获胜。
I've messed around a lot and can't really seem to code the coin flip to behave this way.我已经搞砸了很多,似乎真的无法将硬币翻转编码为这种行为。
This is for a credits balance system which has no IRL value, that is used solely for game servers I host.这适用于没有 IRL 值的积分余额系统,仅用于我托管的游戏服务器。 With the current system a user can easily multiply their balance with an auto clicker, as it's a double or nothing flip.
使用当前系统,用户可以通过自动点击器轻松增加他们的余额,因为它是双翻转或无翻转。
this is what I'm trying right now, but it's not so effective这是我现在正在尝试的,但它不是那么有效
<?PHP
$choices = ["heads", "tails","tails", "heads","heads", "tails","heads", "tails", "heads"];
$result = $choices[random_int(0, count($choices)-1)];
$wager = $_GET['wager'];
$win = $wager *2;
if (!is_numeric($wager)) {
die("You must enter a number for your wager.");
}
if ($wager > $usrdata['money']) {
die("You don't have enough credits to make this bet.");
}
if ($result == "tails") {
if ($_GET['side'] == 0) {
$newrand = rand(0, $wager);
}
$newrandx = rand(0, 1);
if ($newrandx == 1 && $side == 0) {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=HEADS" />';
$side = 1;
} else {
if ($wager/2 >= $newrand) {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=TAILS" />';
$side = 0;
} else {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=HEADS" />';
$side = 1;
}
}
} else {
if ($_GET['side'] == 1) {
$newrand = rand(0, $wager);
}
$newrandx = rand(0, 1);
if ($newrandx == 1 && $side == 1) {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=TAILS" />';
$side = 0;
} else {
if ($newrand >= $wager/2) {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=HEADS" />';
$side = 1;
} else {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=TAILS" />';
$side = 0;
}
}
}
if ($side == $_GET['side']) {
echo '<br/> You won '.$win.' credits!';
$total = $usrdata['money'] + $win;
mysql_query("UPDATE account SET money = '".$total."' WHERE username = '".$usrdata['username']."';") or die(mysql_error());
} else {
echo '<br/> You lost '.$wager.' credits!';
$total = $usrdata['money'] - $wager;
mysql_query("UPDATE account SET money = '".$total."' WHERE username = '".$usrdata['username']."';") or die(mysql_error());
}
?>
The result should be a lower chance of winning with a higher wager, however, it still seems to be an exact 50/50 chance even with the code I've written up.结果应该是更高赌注获胜的机会更低,但是,即使使用我编写的代码,它似乎仍然是准确的 50/50 机会。
this seems to work for my needs这似乎适合我的需要
<?PHP
$wager = $_GET['wager'];
$win = $wager *2;
if ($wager < 10) {
die("You must wager at least 10 credits.");
}
if ($_GET['side'] == 0) {
$values[0] = 0;
$weights[0] = 5;
$values[1] = 1;
$weights[1] = $wager*2;
} else {
$values[0] = 0;
$weights[0] = $wager*2;
$values[1] = 1;
$weights[1] = 5;
}
$side = weighted_random_simple($values, $weights);
if (!is_numeric($wager)) {
die("You must enter a number for your wager.");
}
if ($wager > $usrdata['money']) {
die("You don't have enough credits to make this bet.");
}
if ($side == 0) {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=TAILS" />';
} else {
echo '<img src="https://static.pdglobal.app/?sid=files_go&ID=HEADS" />';
}
if ($side == $_GET['side']) {
echo '<br/> You won '.$win.' credits!';
$total = $usrdata['money'] + $win;
mysql_query("UPDATE account SET money = '".$total."' WHERE username = '".$usrdata['username']."';") or die(mysql_error());
} else {
echo '<br/> You lost '.$wager.' credits!';
$total = $usrdata['money'] - $wager;
mysql_query("UPDATE account SET money = '".$total."' WHERE username = '".$usrdata['username']."';") or die(mysql_error());
}
function weighted_random_simple($values, $weights){
$count = count($values);
$i = 0;
$n = 0;
$num = mt_rand(1, array_sum($weights));
while($i < $count){
$n += $weights[$i];
if($n >= $num){
break;
}
$i++;
}
return $values[$i];
}
?>
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