Online PHP editor | perf for Nijco

@ 2026-07-20T06:48:58Z

<?php
/*
 * Fill in all below and click the blue 'eval();' button.
 * ------------------ */
$server_seed = "";
$client_seed = "";
$game_id     = "";
$chance      = 0.50;     // your chosen chance, e.g. 0.50 for 50%
$direction   = "under";  // "under" or "over"
/* ------------------ */

if ($server_seed == '' || $client_seed === "" || $game_id == '') {
    echo "Fill in details";
    return;
}

// Create HMAC-SHA256 hash
$message = $client_seed . "-" . $game_id;
$hmac_hash = hash_hmac('sha256', $message, $server_seed);

// Convert hex to decimal using bcmath for large numbers
$decimal_value = '0';
$length = strlen($hmac_hash);

for ($i = 0; $i < $length; $i++) {
    $decimal_value = bcmul($decimal_value, '16');
    $decimal_value = bcadd($decimal_value, hexdec($hmac_hash[$i]));
}

// Apply modulo 10^8
$roll = (int) bcmod($decimal_value, '100000000');

// Same threshold/win check as upgrade_start_game() server-side —
// house edge 0.10, symmetric under/over.
$house_edge = 0.10;
$multiplier = (1 - $house_edge) / $chance;
$threshold  = (int) ($chance * 100000000);

$win = $direction !== "over"
    ? $roll < $threshold
    : $roll >= (100000000 - $threshold);

echo "Roll: " . $roll . "\n";
echo $win ? ("Win \xe2\x80\x94 payout " . number_format($multiplier, 4) . "x") : "Loss";
?>

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

Version	System time (s)	User time (s)	Memory (MiB)
8.5.9	0.003	0.004	16.78
8.5.8	0.007	0.010	16.67
8.5.7	0.033	0.008	16.74
8.5.6	0.032	0.007	16.59
8.5.5	0.031	0.010	16.64
8.5.4	0.037	0.010	16.29
8.5.3	0.041	0.007	16.34
8.5.2	0.035	0.008	16.57
8.5.1	0.037	0.004	16.20
8.5.0	0.009	0.010	16.74
8.4.24	0.012	0.009	19.34
8.4.23	0.033	0.013	19.04
8.4.22	0.019	0.006	19.13
8.4.21	0.019	0.006	19.22
8.4.20	0.012	0.007	19.50
8.4.19	0.013	0.007	19.36
8.4.18	0.012	0.007	19.57
8.4.17	0.012	0.007	19.68
8.4.16	0.015	0.004	19.71
8.4.15	0.021	0.006	19.57
8.4.14	0.034	0.011	17.41
8.4.13	0.034	0.009	17.46
8.4.12	0.036	0.014	17.51
8.4.11	0.037	0.010	17.73
8.4.10	0.035	0.008	17.66
8.4.9	0.037	0.009	17.58
8.4.8	0.040	0.008	17.81
8.4.7	0.034	0.011	17.72
8.4.6	0.031	0.011	17.81
8.4.5	0.035	0.004	17.81
8.4.4	0.035	0.009	17.50
8.4.3	0.039	0.009	17.40
8.4.2	0.032	0.012	17.75
8.4.1	0.037	0.010	17.75
8.3.32	0.038	0.009	18.34
8.3.31	0.031	0.008	18.41
8.3.30	0.029	0.008	18.25
8.3.29	0.031	0.008	18.43
8.3.28	0.025	0.007	18.53
8.3.27	0.028	0.006	16.38
8.3.26	0.027	0.008	16.67
8.3.25	0.026	0.007	16.73
8.3.24	0.030	0.007	16.66
8.3.23	0.032	0.008	16.39
8.3.22	0.031	0.012	16.61
8.3.21	0.035	0.009	16.63
8.3.20	0.035	0.008	16.55
8.3.19	0.033	0.010	16.67
8.3.18	0.030	0.005	16.64
8.3.17	0.017	0.004	16.59
8.3.16	0.016	0.004	16.67
8.3.15	0.036	0.008	16.61
8.3.14	0.031	0.009	16.50
8.3.13	0.032	0.007	16.53
8.3.12	0.030	0.007	16.67
8.3.11	0.033	0.007	16.89
8.3.10	0.031	0.007	16.50
8.3.9	0.023	0.004	16.59
8.3.8	0.035	0.007	16.39
8.3.7	0.033	0.006	16.73
8.3.6	0.017	0.004	16.67
8.3.5	0.027	0.008	16.54
8.3.4	0.041	0.007	17.72
8.3.3	0.027	0.006	17.67
8.3.2	0.025	0.010	17.84
8.3.1	0.026	0.006	17.91
8.3.0	0.032	0.004	17.83
8.2.32	0.046	0.008	17.80
8.2.31	0.035	0.006	18.10

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