简单中奖概率

winning.php

<?php

$odds = 90;  //概率

$success = 0;
$fail = 0;
$i = 0;
while ($i < 100) {
    $rnd = mt_rand(0, 99);

    if ($rnd < $odds) {
        $success++;
    } else {
        $fail++;
    }
    $i++;
}

var_dump("中奖次数=" . $success . ", 没中次数=" . $fail);