Online PHP editor | perf for 4umdA

@ 2026-07-20T06:48:12Z

<?php
/*
 * Fill in all four below and click the blue 'eval();' button.
 * ------------------ */
$server_seed = "";
$client_seed = "";
$game_id     = "";
$mine_count  = 3;
/* ------------------ */

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

$grid_size = 25;

// Same hex-to-decimal-via-bcmath approach as the other games, reused per shuffle step.
function hmac_mod($server_seed, $message, $modulus) {
    $hmac_hash = hash_hmac('sha256', $message, $server_seed);
    $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]));
    }
    return (int) bcmod($decimal_value, (string) $modulus);
}

// Fisher-Yates shuffle over all 25 tiles — one HMAC draw per swap, identical
// to get_mines_positions() server-side. Message per step i is
// "{client_seed}-{game_id}-{i}", modulus is i+1.
$positions = range(0, $grid_size - 1);
for ($i = $grid_size - 1; $i > 0; $i--) {
    $message = $client_seed . "-" . $game_id . "-" . $i;
    $r = hmac_mod($server_seed, $message, $i + 1);
    $tmp = $positions[$i];
    $positions[$i] = $positions[$r];
    $positions[$r] = $tmp;
}

$mine_positions = array_slice($positions, 0, $mine_count);
sort($mine_positions);

echo "Mine positions: " . implode(", ", $mine_positions);
?>

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	16.69
8.5.8	0.012	0.007	16.68
8.5.7	0.036	0.005	16.59
8.5.6	0.031	0.010	16.65
8.5.5	0.038	0.005	16.24
8.5.4	0.032	0.008	16.21
8.5.3	0.008	0.010	16.50
8.5.2	0.035	0.007	16.39
8.5.1	0.030	0.011	16.73
8.5.0	0.015	0.009	16.71
8.4.24	0.010	0.011	19.45
8.4.23	0.022	0.006	19.05
8.4.22	0.024	0.008	19.14
8.4.21	0.017	0.003	19.28
8.4.20	0.015	0.005	19.60
8.4.19	0.017	0.005	19.25
8.4.18	0.006	0.006	19.74
8.4.17	0.032	0.008	19.32
8.4.16	0.030	0.014	19.54
8.4.15	0.036	0.010	19.42
8.4.14	0.033	0.009	17.37
8.4.13	0.033	0.008	17.40
8.4.12	0.033	0.007	17.74
8.4.11	0.029	0.006	17.64
8.4.10	0.016	0.004	17.86
8.4.9	0.036	0.010	17.61
8.4.8	0.036	0.010	17.70
8.4.7	0.032	0.012	17.77
8.4.6	0.030	0.013	17.79
8.4.5	0.033	0.011	17.55
8.4.4	0.037	0.009	17.49
8.4.3	0.034	0.008	17.53
8.4.2	0.036	0.008	17.47
8.4.1	0.039	0.005	17.54
8.3.32	0.043	0.005	18.34
8.3.31	0.028	0.013	18.46
8.3.30	0.036	0.007	18.31
8.3.29	0.033	0.008	18.30
8.3.28	0.027	0.008	18.07
8.3.27	0.035	0.005	16.67
8.3.26	0.017	0.008	16.34
8.3.25	0.017	0.006	16.39
8.3.24	0.026	0.002	16.40
8.3.23	0.016	0.006	16.57
8.3.22	0.015	0.006	16.61
8.3.21	0.014	0.005	16.61
8.3.20	0.013	0.007	16.32
8.3.19	0.016	0.003	16.65
8.3.18	0.014	0.005	16.66
8.3.17	0.015	0.005	16.68
8.3.16	0.035	0.004	16.32
8.3.15	0.028	0.008	16.46
8.3.14	0.020	0.004	16.50
8.3.13	0.016	0.004	16.72
8.3.12	0.013	0.004	16.59
8.3.11	0.027	0.008	16.76
8.3.10	0.022	0.005	16.73
8.3.9	0.014	0.006	16.65
8.3.8	0.016	0.005	16.61
8.3.7	0.019	0.010	16.52
8.3.6	0.037	0.005	16.63
8.3.5	0.018	0.004	16.39
8.3.4	0.017	0.004	17.59
8.3.3	0.015	0.001	17.91
8.3.2	0.010	0.005	17.83
8.3.1	0.019	0.003	17.57
8.3.0	0.030	0.004	17.78
8.2.32	0.036	0.011	17.78
8.2.31	0.034	0.006	17.86

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