How to Round Up to the Nearest Multiple of Five in PHP: Three Different Approaches

Rounding Up to the Nearest Multiple of Five in PHP

In programming, rounding values to certain increments is a common task. In this case, we want to round up a given number to the nearest multiple of five in PHP.

To accomplish this, we present three different approaches:

1. Round to the next multiple of 5, excluding the current number:

This method ensures that the rounded value is always greater than or equal to the input value. For instance, 50 rounds up to 55, and 52 also rounds up to 55.

<code class="php">function roundUpToAny($n, $x=5) {
    return round(($n+$x/2)/$x)*$x;
}</code>

2. Round to the nearest multiple of 5, including the current number:

This method allows for both rounding up and down depending on the proximity to the nearest multiple. For example, 50 rounds up to 50, 52 rounds up to 55, and 50.25 rounds down to 50.

<code class="php">function roundUpToAny($n, $x=5) {
    return (round($n)%$x === 0) ? round($n) : round(($n+$x/2)/$x)*$x;
}</code>

3. Round up to an integer, then to the nearest multiple of 5:

This method first rounds up the input to the nearest integer and then rounds up to the nearest multiple of five. Therefore, 50 rounds up to 50, 52 rounds up to 55, and 50.25 also rounds up to 55.

<code class="php">function roundUpToAny($n, $x=5) {
    return (ceil($n)%$x === 0) ? ceil($n) : round(($n+$x/2)/$x)*$x;
}</code>

Each of these approaches provides a slightly different rounding behavior, allowing you to choose the one that best suits your specific requirements.

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