binairy_prefix_to_number.php

<?php

// https://en.wikipedia.org/wiki/Binary_prefix
function binairy_prefix_to_number($string, $mult = null, $exceptions = true)
{
    if (is_numeric($string)) {
        return $string;
    }
    $units = array('', 'k', 'm', 'g', 't', 'p', 'e', 'z', 'y');
    $pattern = sprintf('@^(?<size>\d+([\.,]\d{1,2})?)(?<unit>[%s]?)(?<binary>i?)b?$@i', implode('', $units));

    preg_match($pattern, $string, $matches);
    if (!$matches) {
        if ($exceptions) {
            throw new \InvalidArgumentException(
                sprintf('Pattern %s does not match %s', 
                    var_export($pattern, true),
                    var_export($string, true)));
        }

        return $string;
    }
    $matches += array(
        'size'   => 0,
        'unit'   => '',
        'binary' => '',
    );
    $matches['unit'] = str_replace(',', '.', $matches['unit']);
    if (!$mult) {
        $mult = $matches['binary'] ? 1024 : 1000;
    }

    return ceil($matches['size'] * pow($mult, array_search($matches['unit'], $units)));

}