Online PHP editor | perf for UdfW1

@ 2020-03-30T02:57:20Z

<?php

$valueWeights = [
    149 => 55.555,
    130 => 10.0050,
    131 => 5,
    132 => 5.2,
    133 => 10,
    134 => 10.24,
    135 => 5
];

$mostDecimals = 0;
// not bothering to validate against infinite and extremely fringe case floats
foreach ($valueWeights as $value => $weight) {
    $tempDecimals = 0;
    while ((string)$weight !== (string)floor($weight)) {
        $weight *= 10;  // this is not permanently mutating the weight
        ++$tempDecimals;
    }
    $mostDecimals = max($mostDecimals, $tempDecimals);
}
echo "Most Decimals: {$mostDecimals}\n";
$factor = pow(10, $mostDecimals);
echo "Factor: " , $factor , "\n";
$totalWeight = (array_sum($valueWeights) - 1) * $factor;


for ($i = 0; $i < 10; ++$i) {
    $rand = mt_rand(0, $totalWeight);
    echo "\nRand: " , $rand , "\n";
    $cumulativeScaledWeight = 0;
    foreach ($valueWeights as $value => $weight) {
        $cumulativeScaledWeight += $weight * $factor;
        if ($rand < $cumulativeScaledWeight) {
            echo "Value: {$value}\n";
            break;
        }
    }
}

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)
7.4.4	0.006	0.012	16.45
7.4.3	0.008	0.012	16.41
7.4.2	0.009	0.009	16.46
7.4.1	0.011	0.007	16.60
7.4.0	0.011	0.007	16.54
7.3.16	0.010	0.010	16.27
7.3.15	0.010	0.007	16.73
7.3.14	0.013	0.010	16.53
7.3.13	0.015	0.004	16.32
7.3.12	0.014	0.005	16.27
7.3.11	0.007	0.010	16.65
7.3.10	0.018	0.000	16.36
7.3.9	0.009	0.009	16.50
7.3.8	0.003	0.014	16.29
7.3.7	0.009	0.015	16.30
7.3.6	0.011	0.008	16.59
7.3.5	0.003	0.013	16.53
7.3.4	0.009	0.009	16.43
7.3.3	0.004	0.019	16.35
7.3.2	0.003	0.015	16.44
7.3.1	0.012	0.012	16.48
7.3.0	0.011	0.006	16.39
7.2.29	0.015	0.004	16.74
7.2.28	0.014	0.006	16.56
7.2.27	0.004	0.014	16.68
7.2.26	0.006	0.013	16.63
7.2.25	0.012	0.009	16.49
7.2.24	0.004	0.015	16.64
7.2.23	0.006	0.011	16.55
7.2.22	0.010	0.010	16.70
7.2.21	0.021	0.003	16.44
7.2.20	0.008	0.010	16.66
7.2.19	0.009	0.012	16.48
7.2.18	0.004	0.016	16.48
7.2.17	0.011	0.007	16.51
7.2.16	0.007	0.010	16.63
7.2.15	0.006	0.012	16.86
7.2.14	0.010	0.011	16.68
7.2.13	0.010	0.008	16.72
7.2.12	0.009	0.012	16.59
7.2.11	0.015	0.003	16.81
7.2.10	0.009	0.009	16.83
7.2.9	0.006	0.016	16.70
7.2.8	0.010	0.010	16.54
7.2.7	0.009	0.009	16.36
7.2.6	0.011	0.009	16.61
7.2.5	0.011	0.006	16.67
7.2.4	0.006	0.014	16.69
7.2.3	0.009	0.009	16.65
7.2.2	0.008	0.012	16.73
7.2.1	0.014	0.003	16.68
7.2.0	0.013	0.007	16.68

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