Question

以下是我的数组。我需要根据每个emp_firstname添加其Sum字段。有些只有一次到来，有些只有两次到来。我们如何求和该字段并使数组唯一？

Array
(
    [0] => Array
        (
            [emp_firstname] => Alistair
            [non_pm] => AMZ
            [sum] => 2
        )


    [1] => Array
        (
            [emp_firstname] => Shakkeer
            [non_pm] => SHK
            [sum] => 3
        )

    [2] => Array
        (
            [emp_firstname] => Waqas
            [non_pm] => WAS
            [sum] => 12
        )

    [3] => Array
        (
            [emp_firstname] => Zain
            [non_pm] => ZAI
            [sum] => 9
        )


    [4] => Array
        (
            [emp_firstname] => Shakkeer
            [gud_pmeditor] => SHK
            [sum] => 4
        )

    [5] => Array
        (
            [emp_firstname] => Zain
            [gud_pmeditor] => ZAI
            [sum] => 2
        )

)

Answer 1

您可以使用这种方法获得所需的结果

$res=[];
foreach($arr as $val){
  if(array_key_exists($val['emp_firstname'], $res))
    $res[$val['emp_firstname']]['sum'] = ($res[$val['emp_firstname']]['sum'] + $val['sum']);
  else
    $res[$val['emp_firstname']] = $val;
}

Live Demo

PHP多维数组求和并使其唯一

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