my_round.php

<?php

/** function my_round
 *
 * rounds a value to the closest value
 * starting at another value
 * e.g.- my_round(6.28318, 5, 2) => 7
 *
 * To round to closest of:
 * 2  6  10  14  18  22 ...
 *
 * Each value is 4 more than the previous
 * and the values start at 2
 * So round to the closest 4 starting at 2
 * my_round($val, 4, 2);
 *
 * @param float/int the given value
 * @param int optional the closest value to round to (must be gte +1)
 * @param int optional the starting value to round to (any integer)
 * @return int the rounded value
 */
function my_round($value, $closest = 1, $starting = 0) {
	$closest = (int) $closest;
	$starting = (int) $starting;

	if (1 > $closest) {
		$closest = 1;
	}

	return (int) ((((int) round(($value - $starting) / $closest)) * $closest) + $starting);
}