group array of php objects and sum by object key - php

Question

I have an array of php objects that looks something like this:
Array
(
[0] => stdClass Object
(
[order_id] => 1513
[order_total] => 12500.00
[sales_rep] => Doe_John
)
[1] => stdClass Object
(
[order_id] => 1046
[order_total] => 3300.00
[sales_rep] => Doe_John
)
[2] => stdClass Object
(
[order_id] => 337
[order_total] => 4500.00
[sales_rep] => Mosby_Ted
)
)
I am trying to get an array that is set up more like this:
Array
(
[0] => stdClass Object
(
[sales_rep] => Doe_John
[total_sales] => 15800.00
)
[1] => stdClass Object
(
[sales_rep] => Mosby_Ted
[total_sales] => 4500.00
)
)
I want to combine all of the objects with the same "sales_rep" and get the sum of their associated "order_total", which you can see an example of in my desired array above. Any thoughts on how to accomplish this? I've been at it for hours now and have not been able to figure out a solution.
Thanks so much for the help!

Answer 1

try this
$tmp = array();
foreach($objs as $obj){ // where `$objs` is your objects
if(!in_array($obj->sales_rep,array_keys($tmp))){
$tmp[$obj->sales_rep] = (object)array(
'sales_rep' => $obj->sales_rep,
'total_sales' => $obj->order_total
);
}else{
$tmp[$obj->sales_rep]->total_sales += $obj->order_total;
}
}
print_r(array_values($tmp));

Answer 2

$obj0 = new StdClass();
$obj0->order_id = 1513;
$obj0->order_total = 12500.00;
$obj0->sales_rep = 'Doe_John';
$obj1 = new StdClass();
$obj1->order_id = 1046;
$obj1->order_total = 3300.00;
$obj1->sales_rep = 'Doe_John';
$obj2 = new StdClass();
$obj2->order_id = 337;
$obj2->order_total = 4500.00;
$obj2->sales_rep = 'Mosby_Ted';
$array = array(
$obj0,
$obj1,
$obj2,
);
$newArray = array();
foreach ($array as $item) {
if (array_key_exists($item->sales_rep, $newArray)) {
$newObj = $newArray[$item->sales_rep];
$newObj->order_total += $item->order_total;
} else {
$newObj = new StdClass();
$newObj->sales_rep = $item->sales_rep;
$newObj->order_total = $item->order_total;
$newArray[$newObj->sales_rep] = $newObj;
}
}
print_r(array_values($newArray));