求帮忙一下

select max(concat(a,'-', b)) as a,sum(b) as b  from test

$a = array(10, 30, 50);$b = array(2, 5, 4);$max = max($a);$sum = 0;foreach($a as $i=>$v)  if($v < $max) $sum += $b[$i];echo $max + $sum;

$arr = array(	array(10, 2),	array(30, 5),	array(50, 4));$index = 0;$max = 0;for($i=0,$len=count($arr); $i<$len; $i++){	if($arr[$i][0]>$max){		$max = $arr[$i][0];		$index = $i;	}}$total = $max;for($i=0,$len=count($arr); $i<$len; $i++){	if($i==$index){		continue;	}	$total += $arr[$i][1];}echo $total; // 57

$a = array(10, 30, 50);$b = array(2, 5, 4);$max = max($a);$i = array_search($max, $a);unset($b[$i]);echo $max + array_sum($b);