如何通過定義的鍵來對數組值進行求和？

Question

$array[0] = 100; 
$array[1] = 10; 
$array[2] = 15; 

如何通過key = (0,1)這樣的鍵來獲得數組的總和sum = 110？

Answer 1

$count = 0; 
for($i=0;$i<count($array);$i++){ 
$count = $count + $array[$i]; 
} 

echo $count; 

Answer 2

嘗試用：

$array = array(
    0 => 100, 
    1 => 10, 
    2 => 15 
); 
$keys = array(0, 1); 
$sum = 0; 

foreach ($keys as $key) { 
    $sum += $array[$key]; 
} 

Answer 3

如果要總結INTIAL兩個鍵然後在下面的代碼中使用

：

array_sum(array_slice($array,0,2)); // will return 110 

參考文獻：

array_sum

array_slice

Answer 4

最好的和簡單的方法是

$result = array_sum($your_array); 

Answer 5

$sum = array_sum(
    array_intersect_key($array, array_flip([0,1]) 
); 

沒有測試，但應該工作:)

Answer 6

$array[0] = 100; 
$array[1] = 10; 


$array[2] = 15; 

$sum = function($keys = array(),$arrayList= array()) { 
     $s = 0; 
     foreach ($arrayList as $key => $value) { 
      if(in_array($key, $keys)) { 
       $s+= $value; 
      } 
     } 
     echo $s; 
}; 
$sum(array(0,1),$array); 

Answer 7

試試這個

$array[0] = 100; 
$array[1] = 10; 
$array[2] = 15; 

echo array_sum($array); 

或嘗試這

$array[0] = 100; 
$array[1] = 10; 
$array[2] = 15; 
$sum=0; 
foreach (range(0,1) as $key) 
{ 
    $sum = $sum+$array[$key]; 
} 
echo $sum; 

Answer 8

這裏是我的解決方案通過自定義鍵，總結陣列：

$myArray=Array("Array Title","1000",2000,3000}; // array example with stings and integers 

var_dump(array_intersect_key($myArray, array_flip(Array(1,2)))); // int(3000) 
var_dump($myArray); // int(6000) 

參考文獻：

array_intersect_key

array_flip