[英]Random weighted coin flip in php
我正在嘗試在 php 中創建一個硬幣翻轉算法,該算法根據硬幣翻轉的賭注金額加權。
例如,我希望下注較高的用戶獲勝的機會較低。 下注 1 是 50/50 的機會,但任何事情都會慢慢變得越來越不可能獲勝。
我已經搞砸了很多,似乎真的無法將硬幣翻轉編碼為這種行為。
這適用於沒有 IRL 值的積分余額系統,僅用於我托管的游戲服務器。 使用當前系統,用戶可以通過自動點擊器輕松增加他們的余額,因為它是雙翻轉或無翻轉。
這是我現在正在嘗試的,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());
}
?>
結果應該是更高賭注獲勝的機會更低,但是,即使使用我編寫的代碼,它似乎仍然是准確的 50/50 機會。
這似乎適合我的需要
<?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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