Wie rundet man in PHP auf das nächste Vielfache von Fünf auf?

<code class="php">function roundUpToNearestMultiple($number, $multiplier = 5) {
    // Check if the number is already a multiple of the multiplier
    if ($number % $multiplier == 0) {
        return $number;
    }

    // Calculate the nearest multiple of the multiplier greater than the number
    $nextMultiple = ceil($number / $multiplier) * $multiplier;

    // Round the number up to the next multiple
    return $nextMultiple;
}</code>

<code class="php">echo roundUpToNearestMultiple(52); // Outputs 55
echo roundUpToNearestMultiple(55); // Outputs 55
echo roundUpToNearestMultiple(47); // Outputs 50</code>

<code class="php">function roundUpToNextMultiple($number, $multiplier = 5) {
    return roundUpToNearestMultiple($number + 1, $multiplier);
}</code>

<code class="php">function roundToNearestMultipleInclusive($number, $multiplier = 5) {
    if ($number % $multiplier == 0) {
        return $number;
    }

    $lowerMultiple = floor($number / $multiplier) * $multiplier;
    $upperMultiple = ceil($number / $multiplier) * $multiplier;

    return round($number - $lowerMultiple) > round($upperMultiple - $number) ? $lowerMultiple : $upperMultiple;
}</code>

<code class="php">function roundUpToIntegerAndNearestMultiple($number, $multiplier = 5) {
    $roundedNumber = ceil($number);

    if ($roundedNumber % $multiplier == 0) {
        return $roundedNumber;
    }

    return roundUpToNearestMultiple($roundedNumber, $multiplier);
}</code>