AA制分账

<?php
header('content-type: text/html; charset=utf-8');
/**
 * AA账目
 * @author heping1
 */
class account{
	public $accounts;
	public $income;
	public $pay; 
	public $desc;
	function __construct($accounts)
	{
		foreach($accounts as $k=>$v)
    	{
    		if($v > 0)
    		{
    			$arr_income[$k] = $v;
    		}elseif($v < 0)
    		{
    			$arr_pay[$k] = $v;
    		}
    	}
    	arsort($arr_income);
		asort($arr_pay);
		$this->income = $arr_income;
		$this->pay = $arr_pay;
	}
    function AA()
    {
    	foreach($this->income as $k=>&$v)
    	{
    		foreach($this->pay as $k1=>&$v1)
    		{
    			if($v + $v1 > 0)
    			{
    				$this->desc[] = $k.'给'.$k1.($v1 * -1).'元';
    				$this->income[$k] = $v + $v1;
    				unset($this->pay[$k1]);
    				$this->AA();
    			}else
    			{
    				$this->desc[] = $k.'给'.$k1.$v.'元';
    				$this->pay[$k1] = $v + $v1;
    				unset($this->income[$k]);
    				$this->AA();
    			}
    		}
    	}
    }
}
$accounts = array(
	'A'=>50, // A总共需要支付的金额为50
	'B'=>40,
	'C'=>10,
	'D'=>-20, // D需要收取的金券为20
	'E'=>-30,
	'F'=>-20,
	'G'=>-30,
	'H'=>0
);
$account = new account($accounts);
$account->AA();
print_r($account->desc);
// output :
// Array ( [0] => A给G30元 [1] => A给E20元 [2] => B给E10元 [3] => B给D20元 [4] => B给F10元 [5] => C给F10元)