数组中对某项雷同的值进行求和计算

$arr = array(15) {
  [0]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP1 "
    ["fg_type"]=>
    string(5) "ECU  "
    ["customer_no"]=>
    string(4) "A001"
    ["etype1"]=>
    string(3) "DIG"
    ["RevDegree"]=>
    string(2) "S "
    ["item1"]=>
    float(8810)
    ["rs1"]=>
    float(5787788.527)
    ["item2"]=>
    float(8928)
    ["rs2"]=>
    float(5865309.4176)
  }
  [1]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP1 "
    ["fg_type"]=>
    string(3) "ECU"
    ["customer_no"]=>
    string(4) "A001"
    ["etype1"]=>
    string(3) "MPI"
    ["RevDegree"]=>
    string(1) "B"
    ["item1"]=>
    float(0)
    ["rs1"]=>
    float(0)
    ["item2"]=>
    float(0)
    ["rs2"]=>
    float(0)
  }
  [2]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP1 "
    ["fg_type"]=>
    string(4) "ECU "
    ["customer_no"]=>
    string(4) "A001"
    ["etype1"]=>
    string(3) "MPI"
    ["RevDegree"]=>
    string(2) "S "
    ["item1"]=>
    float(63485)
    ["rs1"]=>
    float(23211270.7503)
    ["item2"]=>
    float(71973)
    ["rs2"]=>
    float(26689668.0654)
  }
  [3]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP1 "
    ["fg_type"]=>
    string(4) "ECU "
    ["customer_no"]=>
    string(4) "A002"
    ["etype1"]=>
    string(3) "MPI"
    ["RevDegree"]=>
    string(2) "S "
    ["item1"]=>
    float(4810)
    ["rs1"]=>
    float(2329072.60146)
    ["item2"]=>
    float(5855)
    ["rs2"]=>
    float(2783605.29921)
  }
  [4]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP1 "
    ["fg_type"]=>
    string(5) "ECU  "
    ["customer_no"]=>
    string(4) "A004"
    ["etype1"]=>
    string(3) "MPI"
    ["RevDegree"]=>
    string(2) "S "
    ["item1"]=>
    float(1716)
    ["rs1"]=>
    float(652004.847)
    ["item2"]=>
    float(1711)
    ["rs2"]=>
    float(647801.6757)
  }
[5]=>
  array(9) {
    ["lppt"]=>
    string(4) "LP2 "
    ["fg_type"]=>
    string(3) "ECU"
    ["customer_no"]=>
    string(4) "A001"
    ["etype1"]=>
    string(3) "MPI"
    ["RevDegree"]=>
    string(1) "B"
    ["item1"]=>
    float(0)
    ["rs1"]=>
    float(0)
    ["item2"]=>
    float(0)
    ["rs2"]=>
    float(0)
  }
};

	$arr = array(
		array('fg_type'=>'ECU1', 'item1'=>8810, 'rs1'=>5787788.527, 'item2'=>8928, 'rs2'=>5865309.4176),
		array('fg_type'=>'ECU1', 'item1'=>0, 'rs1'=>0, 'item2'=>0, 'rs2'=>0),
		array('fg_type'=>'ECU2', 'item1'=>63485, 'rs1'=>23211270.7503, 'item2'=>71973, 'rs2'=>26689668.0654),
		array('fg_type'=>'ECU2', 'item1'=>4810, 'rs1'=>2329072.60146, 'item2'=>5855, 'rs2'=>2783605.29921),
		array('fg_type'=>'ECU3', 'item1'=>1716, 'rs1'=>652004.847, 'item2'=>1711, 'rs2'=>647801.6757),
		array('fg_type'=>'ECU3', 'item1'=>0, 'rs1'=>0, 'item2'=>0, 'rs2'=>0),
	);
	
	$new_arr = array();
 	for($i=0; $i		$arr[$i]['sum'] = $arr[$i]['item1'] + $arr[$i]['rs1'] + $arr[$i]['item2'] + $arr[$i]['rs2'];
		$new_arr[$arr[$i]['fg_type']] = 0;
	}
	
	for($i=0; $i		if(array_key_exists($arr[$i]['fg_type'], $new_arr)){
			$new_arr[$arr[$i]['fg_type']] += $arr[$i]['sum'];
		}
	}
	
	array_push($arr,$new_arr);
	
	echo '
';
	print_r($arr);

测试结果应该没问题，不知道这么写好不好，凑合着看...