累计总foreach循环，使用变量到组号[重复]

Question

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• multidimensional array array_sum 9 answers

I need help regarding foreach and arrays in PHP

Say I have the following array:

$orders = array (
  0 => 
    array (
      'company' => 'Company 1',
      'total' => '5',
    ),
  1 => 
    array (
      'company' => 'Company 2',
      'total' => '10',
    ),
  2 => 
    array (
      'company' => 'Company 1',
      'total' => '15',
    ),
  3 => 
    array (
      'company' => 'Company 1',
      'total' => '5',
    ),
  4 => 
    array (
      'company' => 'Company 3',
      'total' => '12',
    )
);

Order 1 is 5 for Company 1
Order 2 is 10 for Company 2
Order 3 is 15 for Company 1
Order 4 is 5 for Company 2
Order 5 is 12 for Company 3

I want the output to show the company name and the accumulative total of each company's orders

For example:

Company 1           20
Company 2           15
Company 3           12

</div>

Answer 1

Just create another array that will track the orders.

$companies = array();
foreach ($orders as $order) {
    if (array_key_exists($order["company"], $companies)) {
        $companies[$order["company"]] += $order["total"];
    } else {
        $companies[$order["company"]] = $order["total"];
    }
}

First, we check if the company is already in the companies array, if it is then we add the total to that company's current total.
Otherwise, we just create a new key and store the total.

Additionally, you can write (int)$order["total"] to typecast into integer.
This might be useful to ensure that you have the correct data.