How to sum array values,array was created from SQL query

Question

I want to sum an associative array values.The array was created from SQL query.

I tried to sum with array_sum,but array sum was not worked because,my array is not a typical array ($array=array(1,2,3)). Array_sum will return 0.

public function getAge(){
    if(isset($_SESSION['age_hold']) && !empty($_SESSION['age_hold']) ){
        $sqlAge="SELECT age FROM unisex 
        WHERE age >=".$_SESSION['age_hold'] ;
        $age= Yii::$app->db->createCommand($sqlAge)->queryAll();
        return $age;
    }
}


   $age=$this->getAge();
$length=count($age);





   $ageSummation=0;
  foreach($age as $key=>$item) {
  $ageSummation=$ageSummation+$item;
 }   

Displaying $age array:

 Array ( [0] => Array ( [age] => 90 ) [1] => Array ( [age] => 91 ) [2] => Array ( [age] => 92 ) [3] => Array ( [age] => 93 ) [4] => Array ( [age] => 94 ) [5] => Array ( [age] => 95 ) [6] => Array ( [age] => 96 ) [7] => Array ( [age] => 97 ) [8] => Array ( [age] => 98 ) [9] => Array ( [age] => 99 ) [10] => Array ( [age] => 100 ) ) 

When i run the code with that foreach, the error is "Unsupported operand types".

I expect to output to be 90+91+92+...+100

Answer 1

The items in $age are arrays, not integers. You're getting ""Unsupported operand types" because you're trying to add them to 0.

You can use array_column to sum the age key.

$ageSummation = array_sum(array_column($age, 'age'));

You could also do it in your query, unless you're going to use the individual values for something. I see you also have $length=count($age); in your code, which suggests you may be calculating an average age - you can do that in the query as well if you like.

SELECT AVG(age) FROM unisex WHERE age >= ?;

Answer 2

You're probably looking for array_column() to get all of the age values in the nested array:

array_sum(array_column($age, 'age'))

Or if you have other logic to apply in the loop, you could just use the age key in your existing code:

foreach($age as $item) 
    $ageSummation=$ageSummation+$item['age'];