A simple PHP class to evenly distribute an integer across a set of multiple integer values.

class.divide_num.php

<?php
//error_reporting(E_ALL);
//ini_set('display_errors', '1');

$dv = new divide_num(101);

$arr = array(111, 222, 333);
var_dump($arr);

foreach ($arr as $key=>$ar) {
	$dv->add_target($arr[$key]);
}
$dv->distribute_evenly();
//$dv->distribute_proportionately();

var_dump($arr);

unset($dv);

var_dump($arr);


class divide_num {
	private $num;
	private $targets = array();

	public function __construct($num) {
		$this->num = $num;
	}

	public function add_target(&$target) {
		$this->targets[] = &$target;
	}

	public function distribute_evenly($num = false) {
		if (!$num) {
			$num = &$this->num;
		}
		$major = (int)($num / count($this->targets));
		$minor = (int)($num % count($this->targets));
		foreach ($this->targets as $key=>$target) {
			$this->targets[$key] += $major;
			if ($minor >= 1) {
				$this->targets[$key] += 1;
				$minor--;
			}
		}
	}

	public function distribute_proportionately() {
		$sum = array_sum($this->targets);
		$num_less = $this->num;
		foreach ($this->targets as $key=>$target) {
			$portion = (int)($this->num * ($target / $sum));
			$this->targets[$key] += $portion;
			$num_less -= $portion;
		}
		$this->distribute_evenly($num_less);
	}
}
?>