How can i sort array in php - php

Question

Please let me know how can sort array with one column line_total descending format. I want that array in line_total descending format bcoz i want to display data upper sale to lower sale. So please help me.
Array
(
[totalusers] => 1
[TranReport] => Array
(
[start] => 01-01-2017
[end] => 31-12-2017
)
[webhits] => 794
[paypal] => Yes
[cash] => No
[Transactions] => Array
(
[0] => Array
(
[order_date] => 03-02-2017
[customer_name] => Mohsin khan
[payment_method] => PayPal
[product_list] => Array
(
[0] => Array
(
[product_name] => USB Cable – Iphone → 1M USB Cable - Iphone
[qty] => 1
[line_total] => 9
)
[1] => Array
(
[product_name] => USB Cable – Iphone → 2M USB Cable - Iphone
[qty] => 2
[line_total] => 24
)
)
[quantity] => 3
[order_currency] => USD
[order_total] => 48.00$
[new_total] => 48.00
)
[1] => Array
(
[order_date] => 09-01-2017
[customer_name] => Mohsin khan
[payment_method] => PayPal
[product_list] => Array
(
[0] => Array
(
[product_name] => AA USB Charger
[qty] => 1
[line_total] => 15
)
[1] => Array
(
[product_name] => Car Charger - Dual USB - Low Profile
[qty] => 1
[line_total] => 15
)
[2] => Array
(
[product_name] => Mister Hose → 20m Mister Hose
[qty] => 1
[line_total] => 20
)
)
[quantity] => 3
[order_currency] => USD
[order_total] => 50.00$
[new_total] => 50.00
)
[2] => Array
(
[order_date] => 07-01-2017
[customer_name] => Mohsin khan
[payment_method] => PayPal
[product_list] => Array
(
[0] => Array
(
[product_name] => Quick Charge V3 - Dual USB - Car Charger
[qty] => 1
[line_total] => 15
)
[1] => Array
(
[product_name] => Car Charger - Dual USB - Low Profile
[qty] => 1
[line_total] => 15
)
[2] => Array
(
[product_name] => Mister Hose → 20m Mister Hose
[qty] => 1
[line_total] => 20
)
)
[quantity] => 1
[order_currency] => USD
[order_total] => 15.00$
[new_total] => 15.00
)
)
[deliveytotal] => 0
)

Answer 1

You need to use usort function http://php.net/manual/en/function.uksort.php . The rest is just my interpretation of what you want to achieve - sort transactions by sum of line_total in products
$array = []; //your array
function sumLinesTotal($product_list) {
return array_sum(array_map($product_list, function($product){
return $product['line_total'];
});
}
usort($array['Transactions'], function ($a, $b) {
return sumLinesTotal($a) < sumLinesTotal($b);
});