sorting - PHP sort object with usort based on two values -

i'm trying sort object array based on minimal sum. working, want add usort function comparison, prefer object, have 1 value true. objects:

object(basket)[33]       public 'products' =>          array (size=2)           0 =>              object(product)[13]               public 'name' => string 'name one' (length=8)               public 'price' => float 0.75               public 'exist' => boolean true           1 =>              object(product)[7]               public 'name' => string 'name two' (length=8)               public 'price' => float 2.39               public 'exist' => boolean true       public 'sum' => float 3.14  object(basket)[34]       public 'products' =>          array (size=2)           0 =>              object(product)[19]               public 'name' => string 'name one' (length=8)               public 'price' => float 0.75               public 'exist' => boolean true           1 =>              object(product)[72]               public 'name' => string 'name two' (length=8)               public 'price' => null               public 'exist' => boolean false       public 'sum' => float 0.75  object(basket)[35]       public 'products' =>          array (size=2)           0 =>              object(product)[1]               public 'name' => string 'name one' (length=8)               public 'price' => float 0.75               public 'exist' => boolean true           1 =>              object(product)[2]               public 'name' => string 'name two' (length=8)               public 'price' => float 1.75               public 'exist' => boolean true       public 'sum' => float 2.5 

and if sort this, order basket[34],basket[35],basket[33].

but want basket[35],basket[33] , @ end basket[34], because has 1 product, doesn't exist.

so want order based on product existation , sort sum. have this, doesn't work:

usort($h_basket[$i], function($a, $b) {     return $a->sum > $b->sum; }); usort($h_basket[$i], function($a, $b) {   $unfinded_a = 0;   $unfinded_b = 0;   foreach ($a->products $product) {     if(!$product->exist) {       $unfinded_a++;     }   }   foreach ($b->products $product) {     if(!$product->exist) {       $unfinded_b++;     }   }   if ($unfinded_a != 0 || $unfinded_b != 0)   return $unfinded_b > $unfinded_a; }); 

is possible usort, or have use array_multisort?

to sort "exists" field (and assume greater percentage of carts products exist, higher should sorted)

i suggest use array_filter simple count of how many products have 'exists' vs total e.g.

$exists = count(     array_filter(         $object->products,         function ($product) {             return $product->exist;         }     ) ) / count($object->products); 

then compare calculated $exists value 2 baskets being compared.

to sort multiple fields (exists, , sum) believe you'll need call usort twice, in reverse order - sort sum first then exists