Online PHP editor | perf for RtGLU

@ 2024-05-22T18:26:37Z

<?php
function parseScientificNotation($scientificString) {
    // Explode the string into mantissa and exponent parts
    $parts = explode('e', strtolower($scientificString));
    
    if (count($parts) != 2) {
        return "Invalid scientific notation";
    }

    $mantissa = $parts[0];
    $exponent = (int) $parts[1];

    // Determine if the number is negative
    $isNegative = false;
    if ($mantissa[0] == '-') {
        $isNegative = true;
        $mantissa = substr($mantissa, 1);
    } elseif ($mantissa[0] == '+') {
        $mantissa = substr($mantissa, 1);
    }

    // Split the mantissa into integer and fractional parts
    $mantissaParts = explode('.', $mantissa);
    $integerPart = $mantissaParts[0];
    $fractionalPart = isset($mantissaParts[1]) ? $mantissaParts[1] : '';

    // Normalize the mantissa by removing the decimal point
    $mantissaNormalized = $integerPart . $fractionalPart;

    // Calculate the shift based on the exponent
    $shift = $exponent - strlen($fractionalPart);

    if ($shift >= 0) {
        // Positive exponent: add zeros to the right
        $number = $mantissaNormalized . str_repeat('0', $shift);
    } else {
        // Negative exponent: add zeros to the left and insert the decimal point
        $decimalPointPosition = strlen($integerPart) + $shift;
        if ($decimalPointPosition > 0) {
            $number = substr($mantissaNormalized, 0, $decimalPointPosition) . '.' . substr($mantissaNormalized, $decimalPointPosition);
        } else {
            $number = '0.' . str_repeat('0', -$decimalPointPosition) . $mantissaNormalized;
        }
    }

    // Restore the sign if the number was negative
    if ($isNegative) {
        $number = '-' . $number;
    }

    // Return the constructed number
    return $number;
}

// Example large scientific notation string
//$scientificString = "1.23e308";
$scientificString = (string) 1 / 1000000;

// Parse and convert the string
$result = parseScientificNotation($scientificString);

echo $result;
?>

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)
8.3.11	0.006	0.003	20.94
8.3.10	0.000	0.009	24.06
8.3.9	0.014	0.000	26.77
8.3.8	0.003	0.006	18.55
8.3.7	0.036	0.014	17.81
8.3.6	0.042	0.010	17.81
8.3.5	0.013	0.007	18.36
8.3.4	0.037	0.004	17.81
8.3.3	0.028	0.013	17.81
8.3.2	0.031	0.000	17.81
8.3.1	0.019	0.003	17.81
8.3.0	0.016	0.006	17.81
8.2.23	0.009	0.000	22.58
8.2.22	0.000	0.015	37.54
8.2.21	0.003	0.005	26.77
8.2.20	0.006	0.003	18.42
8.2.19	0.020	0.004	17.81
8.2.18	0.020	0.006	17.81
8.2.17	0.015	0.009	18.00
8.2.16	0.019	0.008	19.48
8.2.15	0.021	0.006	17.81
8.2.14	0.034	0.000	17.81
8.2.13	0.016	0.009	17.81
8.2.12	0.023	0.000	17.81
8.2.11	0.019	0.006	17.81
8.2.10	0.016	0.006	17.81
8.2.9	0.016	0.006	17.81
8.2.8	0.021	0.004	17.81
8.2.7	0.029	0.003	17.81
8.2.6	0.028	0.014	17.81
8.2.5	0.038	0.007	17.81
8.2.4	0.031	0.012	17.81
8.2.3	0.029	0.014	17.81
8.2.2	0.028	0.009	17.81
8.2.1	0.026	0.006	17.81
8.2.0	0.026	0.006	17.81
8.1.29	0.000	0.010	30.84
8.1.28	0.029	0.006	17.81
8.1.27	0.024	0.000	17.81
8.1.26	0.027	0.007	17.81
8.1.25	0.021	0.010	17.81
8.1.24	0.018	0.007	17.81
8.1.23	0.018	0.004	17.81
8.1.22	0.017	0.008	17.81
8.1.21	0.021	0.006	17.81
8.1.20	0.014	0.010	17.81
8.1.19	0.021	0.003	17.81
8.1.18	0.018	0.006	17.81
8.1.17	0.020	0.007	17.81
8.1.16	0.023	0.005	17.81
8.1.15	0.017	0.010	17.81
8.1.14	0.010	0.013	17.81
8.1.13	0.024	0.003	17.81
8.1.12	0.025	0.000	17.81
8.1.11	0.016	0.008	17.81
8.1.10	0.019	0.008	17.81
8.1.9	0.033	0.011	17.81
8.1.8	0.030	0.012	17.81
8.1.7	0.029	0.010	17.81
8.1.6	0.037	0.006	17.81
8.1.5	0.037	0.007	17.81
8.1.4	0.041	0.003	17.81
8.1.3	0.036	0.010	17.81
8.1.2	0.036	0.008	17.81
8.1.1	0.033	0.003	17.81
8.1.0	0.021	0.003	17.81

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