Join array elements, display only lowest value - php

Question

My array:
array (size=3)
0 =>
object(stdClass)[20]
public 'PkID' => string '488' (length=3)
public 'Price' => string '666' (length=3)
public 'discount_id' => string '1' (length=1)
1 =>
object(stdClass)[38]
public 'PkID' => string '490' (length=3)
public 'Price' => string '999' (length=3)
public 'discount_id' => string '2' (length=1)
2 =>
object(stdClass)[41]
public 'PkID' => string '489' (length=3)
public 'Price' => string '111' (length=3)
public 'discount_id' => string '1' (length=1)
Question is how can I group elements together that share the same discount_id number. But when I group, I wish that only the lowest Price integer is displayed.
EDIT: I tried
foreach ($array as $value)
{
$new_array[$value->discount_id] = $value;
}
Which returns grouped arrays like so:
array (size=2)
1 =>
object(stdClass)[41]
public 'PkID' => string '489' (length=3)
public 'Price' => string '111' (length=3)
public 'discount_id' => string '1' (length=1)
2 =>
object(stdClass)[38]
public 'PkID' => string '490' (length=3)
public 'Price' => string '999' (length=3)
public 'discount_id' => string '2' (length=1)
But I don't know how to display the smallest price from those two grouped elements (in the example above it is the smallest but this is only coincidence)

Answer 1

$new_array = array();
foreach ($array as $value) {
if (array_key_exists($value->discount_id, $new_array)) { // element with given discount_id already exists
if ($new_array[$value->discount_id]->Price > $value->Price) { // existing element has higher price - replace it
$new_array[$value->discount_id] = $value;
}
} else { // add new element
$new_array[$value->discount_id] = $value;
}
}
simplified:
$new_array = array();
foreach ($array as $value)
if (!array_key_exists($value->discount_id, $new_array) || $new_array[$value->discount_id]->Price > $value->Price) // no element or existing element has higher price
$new_array[$value->discount_id] = $value;