Online PHP editor | rfc for dDrUO

@ 2024-11-21T19:16:00Z

<?php

declare(strict_types=1);

function myBcRound(string $numstr, int $precision = 2): string
{
    if ($precision >= 0) {
        $addition = '0.' . str_repeat('0', $precision) . '5';
    } else {
        throw new Exception('bcround with negative precision is not implemented.');
    }

    return bcdiv(bcadd($numstr, $addition, $precision + 1), '1', $precision);
}

$testCases = [
    ['source' => '123.0454000', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.0454499', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.0454500', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.0454900', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.0454999999999', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.045499999999999', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.045499999999999999999', 'scale' => 3, 'result' => '123.045'],
    ['source' => '123.0455000', 'scale' => 3, 'result' => '123.046'],
    ['source' => '123.0456000', 'scale' => 3, 'result' => '123.046'],
    ['source' => '123.0456789', 'scale' => 3, 'result' => '123.046'],
    [],
    ['source' => '123.454000', 'scale' => 2, 'result' => '123.45'],
    ['source' => '123.454499', 'scale' => 2, 'result' => '123.45'],
    ['source' => '123.454500', 'scale' => 2, 'result' => '123.45'],
    ['source' => '123.454900', 'scale' => 2, 'result' => '123.45'],
    ['source' => '123.454999999999', 'scale' => 2, 'result' => '123.45'],// round() ok
    ['source' => '123.45499999999999', 'scale' => 2, 'result' => '123.45'],// round() ok (in php84+, not ok < 84)
    ['source' => '123.45499999999999999999', 'scale' => 2, 'result' => '123.45'],// round() not ok
    ['source' => '123.455000', 'scale' => 2, 'result' => '123.46'],
    ['source' => '123.456000', 'scale' => 2, 'result' => '123.46'],
    ['source' => '123.456789', 'scale' => 2, 'result' => '123.46'],
    [],
    ['source' => '123.54000', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.54499', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.54500', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.54900', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.54999999999', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.5499999999999', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.5499999999999999999', 'scale' => 1, 'result' => '123.5'],
    ['source' => '123.55000', 'scale' => 1, 'result' => '123.6'],
    ['source' => '123.56000', 'scale' => 1, 'result' => '123.6'],
    ['source' => '123.56789', 'scale' => 1, 'result' => '123.6'],
    [],
    ['source' => '123.4000', 'scale' => 0, 'result' => '123'],
    ['source' => '123.4499', 'scale' => 0, 'result' => '123'],
    ['source' => '123.4500', 'scale' => 0, 'result' => '123'],
    ['source' => '123.4900', 'scale' => 0, 'result' => '123'],
    ['source' => '123.4999999999', 'scale' => 0, 'result' => '123'],
    ['source' => '123.499999999999', 'scale' => 0, 'result' => '123'],
    ['source' => '123.499999999999999999', 'scale' => 0, 'result' => '123'],
    ['source' => '123.5000', 'scale' => 0, 'result' => '124'],
    ['source' => '123.6000', 'scale' => 0, 'result' => '124'],
    ['source' => '123.6789', 'scale' => 0, 'result' => '124'],
];

foreach ($testCases as $testCase) {
    if (count($testCase) === 0) {
        echo "\n";
        continue;
    }
    $source = $testCase['source'];
    $scale = $testCase['scale'];
    $result = $testCase['result'];

    echo str_pad($source, 25) . ' => ';

    $output = [];

    // new function myBcRound
    $roundedNumber1 = myBcRound($source, $scale);
    $output['myBcRound'] = $roundedNumber1 . ' ' . ($roundedNumber1 === $result ? '  OK' : 'FAIL');

    // PHP8.4 bcround (only if you run on git.master branch on 3v4l.org or local PHP8.4 version)
    $roundedNumber2 = '';
    if (version_compare(PHP_VERSION, '8.4', '>=')) {
        $roundedNumber2 = bcround($source, $scale);
    }
    $output['bcround'] = $roundedNumber2 . ' ' . ($roundedNumber2 === $result ? '  OK' : 'FAIL');

    // round(float)
    $roundedNumber3 = (string) round((float) $source, $scale);
    $output['round'] = $roundedNumber3 . ' ' . ($roundedNumber3 === $result ? '  OK' : 'FAIL');

    foreach ($output as $key => $value) {
        echo $key . ' = ' . str_pad($value, 7) . ' ';
    }

    echo "\n";
}

Output for git.master_jit, git.master: 123.0454000 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.045 OK 123.0454499 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.045 OK 123.0454500 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.045 OK 123.0454900 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.045 OK 123.0454999999999 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.045 OK 123.045499999999999 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.046 FAIL 123.045499999999999999999 => myBcRound = 123.045 OK bcround = 123.045 OK round = 123.046 FAIL 123.0455000 => myBcRound = 123.046 OK bcround = 123.046 OK round = 123.046 OK 123.0456000 => myBcRound = 123.046 OK bcround = 123.046 OK round = 123.046 OK 123.0456789 => myBcRound = 123.046 OK bcround = 123.046 OK round = 123.046 OK 123.454000 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.454499 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.454500 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.454900 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.454999999999 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.45499999999999 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.45 OK 123.45499999999999999999 => myBcRound = 123.45 OK bcround = 123.45 OK round = 123.46 FAIL 123.455000 => myBcRound = 123.46 OK bcround = 123.46 OK round = 123.46 OK 123.456000 => myBcRound = 123.46 OK bcround = 123.46 OK round = 123.46 OK 123.456789 => myBcRound = 123.46 OK bcround = 123.46 OK round = 123.46 OK 123.54000 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.54499 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.54500 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.54900 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.54999999999 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.5499999999999 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.5 OK 123.5499999999999999999 => myBcRound = 123.5 OK bcround = 123.5 OK round = 123.6 FAIL 123.55000 => myBcRound = 123.6 OK bcround = 123.6 OK round = 123.6 OK 123.56000 => myBcRound = 123.6 OK bcround = 123.6 OK round = 123.6 OK 123.56789 => myBcRound = 123.6 OK bcround = 123.6 OK round = 123.6 OK 123.4000 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.4499 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.4500 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.4900 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.4999999999 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.499999999999 => myBcRound = 123 OK bcround = 123 OK round = 123 OK 123.499999999999999999 => myBcRound = 123 OK bcround = 123 OK round = 124 FAIL 123.5000 => myBcRound = 124 OK bcround = 124 OK round = 124 OK 123.6000 => myBcRound = 124 OK bcround = 124 OK round = 124 OK 123.6789 => myBcRound = 124 OK bcround = 124 OK round = 124 OK

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