ช่วยแนะนำวิธีการจับคู่โดยหาผลรวมจากรายได้หน่อยครับ ขอบคุณครับ

<?php
$a = array('A' => 10000,'B' => 15000,'C' => 20000,'D' => 25000,'E' => 30000,'F' => 35000,'M'=>3000);
$b = array( 'G' => 14000,'H' => 28000,'I' => 35000);
$c = array(); $d = array();
function pre_array($s){
	$l = strlen(max($s)); $t = array();
	foreach($s as $k=>$v){ $p='a'.str_pad($v, $l, '0',STR_PAD_LEFT); $t[$p] = array('id'=>$k, 'value'=>$v); }
	return $t;
}
function sort_ab($s){
	$t = array(); foreach($s as $k=>$v){ $t[]=$k;} sort($t); return $t;
}
function search_match($v, $ar, $vl, &$cur){
	$min = 0; $i=count($ar);
	while($i){
		$i--; $k=$ar[$i];
		$dif = ($vl[$k]['value'] - $v); 
		if( $dif==0 ){$cur=$k; break;}
		if( ($dif>0) && (!$min || $dif<$min ) ){ $min = $dif; $cur = $k;}
	} return ($cur!='');
}
function set_c($a, $b, &$c){
	$x = sort_ab($a); $y = sort_ab($b); $i=count($x);
	while($i){
		$i--; $m=$x[$i]; $n=''; $v=$a[$m]['value'];
		if(search_match($v, $y, $b, $n)){
			if(!isset($c[$n])) $c[$n]=array(); 
			$c[$n][]=array($a[$m]['id'], $v );
			$b[$n]['value'] -= $a[$m]['value'];
		}
	}
}
$x=pre_array($a); $y=pre_array($b);
set_c( $x, $y, $c);
echo '<table border=1>';
foreach($c as $k=>$v){
	$i=0;
	foreach($v as $m=>$vl){
		echo '<tr><td>'.(!$i? $y[$k]['id'] : '').'</td><td>'.(!$i? $y[$k]['value']:'').'</td>',
			'<td>'.$vl[0].'</td><td>'.$vl[1].'</td></tr>';
		$i++;
	}
}
echo '</table>';