顯示具有相同鍵的兩個數組值的總和

Question

我有兩個具有相同鍵的數組，這兩個數組包含我的表的月份數據。我想這個值的總和，並在另外一個數組的形式返回的值相同的密鑰和

這裏是我的兩個陣列

數組1

Array ([0] => Array ([0] => Jan [1] => 0) 
     [1] => Array ([0] => Feb [1] => 22) 
     [2] => Array ([0] => Mar [1] => 0) 
     [3] => Array ([0] => Apr [1] => 9) 
     [4] => Array ([0] => May [1] => 1) 
     [5] => Array ([0] => Jun [1] => 0) 
     [6] => Array ([0] => Jul [1] => 0) 
     [7] => Array ([0] => Aug [1] => 0) 
     [8] => Array ([0] => Sep [1] => 0) 
     [9] => Array ([0] => Oct [1] => 0) 
     [10] => Array ([0] => Nov [1] => 0) 
     [11] => Array ([0] => Dec [1] => 0) 
    ) 

數組2：

Array ([0] => Array ([0] => Jan [1] => 0) 
     [1] => Array ([0] => Feb [1] => 0) 
     [2] => Array ([0] => Mar [1] => 18) 
     [3] => Array ([0] => Apr [1] => 1) 
     [4] => Array ([0] => May [1] => 1) 
     [5] => Array ([0] => Jun [1] => 0) 
     [6] => Array ([0] => Jul [1] => 0) 
     [7] => Array ([0] => Aug [1] => 0) 
     [8] => Array ([0] => Sep [1] => 0) 
     [9] => Array ([0] => Oct [1] => 0) 
     [10] => Array ([0] => Nov [1] => 0) 
     [11] => Array ([0] => Dec [1] => 0) 
    ) 

我也嘗試使用此代碼

function sum_arrays($array1, $array2) { 
    $array = array(); 
    foreach($array1 as $index => $value) { 
     $array[$index] = isset($array2[$index]) ? $array2[$index] + $value : $value; 
    } 
    return $array; 
} 

我想要導致像下面

Array ([0] => Array ([0] => Jan [1] => 0) 
     [1] => Array ([0] => Feb [1] => 22) 
     [2] => Array ([0] => Mar [1] => 18) 
     [3] => Array ([0] => Apr [1] => 10) 
     [4] => Array ([0] => May [1] => 2) 
     [5] => Array ([0] => Jun [1] => 0) 
     [6] => Array ([0] => Jul [1] => 0) 
     [7] => Array ([0] => Aug [1] => 0) 
     [8] => Array ([0] => Sep [1] => 0) 
     [9] => Array ([0] => Oct [1] => 0) 
     [10] => Array ([0] => Nov [1] => 0) 
     [11] => Array ([0] => Dec [1] => 0) 
    ) 

Answer 1

array_map的方法（如果2個數組有個月在相同的順序）：

// shortened array samples 
$arr1 = [ 
    ["Jan", 0], 
    ["Feb", 22], 
    ["Mar", 0] 
]; 

$arr2 = [ 
    ["Jan", 0], 
    ["Feb", 0], 
    ["Mar", 18] 
]; 

$result = array_map(function($a, $b){ 
    return [$a[0], $a[1] + $b[1]]; 
}, $arr1, $arr2); 

print_r($result); 

輸出：

Array 
(
    [0] => Array 
     (
      [0] => Jan 
      [1] => 0 
     ) 

    [1] => Array 
     (
      [0] => Feb 
      [1] => 22 
     ) 

    [2] => Array 
     (
      [0] => Mar 
      [1] => 18 
     ) 
) 

Answer 2

使用foreach循環：

$sum = 0; 

foreach($items as $item) { 
    $sum += $item['qty']; 
} 

echo $sum; 

使用array_map（）：

echo array_sum(array_map(
    function($item) { 
     return $item['qty']; 
    }, $items) 
); 

使用array_reduce（）：

echo array_reduce($items, function($carry, $item) { 
    $carry += $item['qty']; 
    return $carry; 
});