Online PHP editor | perf for s9mlE

@ 2014-02-20T15:42:02Z

<?php
function convertFloat($float)
{
    $float = strtolower((string)$float);
    $expPos = strpos($float, 'e');

    if ($expPos === false) {
    	return $float;
    }

    $beforeDot = '0'; // Well, fuck you my English.
    $afterDot = ''; // ^^
    $numberWithoutPrecision = substr($float, 0, $expPos);
    $exp = (int)substr($float, $expPos + 1, strlen($float));

    if ($exp === 0) {
        return '1';
    }

    $dotPos = strpos($numberWithoutPrecision, '.');

    if ($dotPos === false) {
        $beforeDot = $numberWithoutPrecision;
    } else {
        $beforeDot = substr($numberWithoutPrecision, 0, $dotPos);
        $afterDot = substr($numberWithoutPrecision, $dotPos + 1, strlen($numberWithoutPrecision));
        $afterDot = rtrim($afterDot, '0');
    }

    $beforeDot = ltrim($beforeDot, '0');

    if ($exp < 0) {
        $exp = -$exp;
        $len = strlen($beforeDot);

        if ($len <= $exp) {
            return '0.'.str_repeat('0', $exp - $len).$beforeDot.$afterDot;
        } else {
            return substr($beforeDot, 0, $len - $exp).'.'.substr($beforeDot, $len - $exp, $len).$afterDot;
        }
    } else {
        $len = strlen($afterDot);

        if ($len <= $exp) {
       		return $beforeDot.$afterDot.str_repeat('0', $exp - $len).'i';
        } else {
            return $beforeDot.substr($afterDot, 0, $exp).'.'.substr($afterDot, $exp, $len);
        }
    }
}

//var_dump(convertFloat('11111111111111111111111111111111111111111111111111111111111112e-60'));
var_dump(convertFloat('+1.'), var_dump((string)+1.);

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)
5.4.25	0.010	0.050	18.66
5.4.24	0.013	0.050	19.00
5.4.23	0.007	0.053	18.96
5.4.22	0.017	0.050	18.77
5.4.21	0.013	0.050	18.94
5.4.20	0.010	0.073	18.80
5.4.19	0.007	0.053	19.09
5.4.18	0.010	0.067	18.62
5.4.17	0.000	0.063	18.75
5.4.16	0.007	0.050	18.89
5.4.15	0.013	0.050	18.98
5.4.14	0.017	0.047	16.41
5.4.13	0.003	0.050	16.44
5.4.12	0.010	0.047	16.50
5.4.11	0.007	0.073	16.62
5.4.10	0.013	0.043	16.54
5.4.9	0.013	0.043	16.47
5.4.8	0.010	0.047	16.62
5.4.7	0.010	0.050	16.38
5.4.6	0.017	0.040	16.48
5.4.5	0.013	0.047	16.46
5.4.4	0.013	0.047	16.41
5.4.3	0.013	0.043	16.39
5.4.2	0.010	0.050	16.48
5.4.1	0.017	0.047	16.36
5.4.0	0.013	0.047	15.98
5.3.28	0.007	0.050	14.44
5.3.27	0.003	0.057	14.59
5.3.26	0.010	0.070	14.64
5.3.25	0.013	0.047	14.86
5.3.24	0.013	0.050	14.60
5.3.23	0.013	0.047	14.75
5.3.22	0.010	0.047	14.77
5.3.21	0.010	0.053	14.76
5.3.20	0.003	0.050	14.60
5.3.19	0.017	0.063	14.72
5.3.18	0.013	0.047	14.41
5.3.17	0.007	0.050	14.63
5.3.16	0.017	0.043	14.74
5.3.15	0.013	0.043	14.64
5.3.14	0.000	0.053	14.59
5.3.13	0.003	0.057	14.79
5.3.12	0.007	0.053	14.55
5.3.11	0.010	0.050	14.65
5.3.10	0.010	0.063	14.16
5.3.9	0.023	0.050	13.87
5.3.8	0.003	0.053	14.00
5.3.7	0.007	0.050	14.04
5.3.6	0.003	0.053	14.11
5.3.5	0.000	0.077	14.04
5.3.4	0.010	0.047	13.98
5.3.3	0.013	0.043	13.99
5.3.2	0.010	0.043	13.79
5.3.1	0.003	0.053	13.89
5.3.0	0.007	0.050	13.65

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