PHP, Trier tableau selon une colonne

Bonjour,

J'ai en PHP le tableau suivant:

Array
(
[0] => Array
(
[id_specific_price] => 60
[id_product] => 8
[id_shop] => 0
[id_currency] => 0
[id_country] => 0
[id_group] => 0
[price] => 0.000000
[from_quantity] => 5
[reduction] => 0.500000
[reduction_type] => percentage
[from] => 0000-00-00 00:00:00
[to] => 0000-00-00 00:00:00
[score] => 0
[quantity] => 5
[real_value] => 50
[nextQuantity] => 3
)

[1] => Array
(
[id_specific_price] => 59
[id_product] => 8
[id_shop] => 0
[id_currency] => 0
[id_country] => 0
[id_group] => 0
[price] => 0.000000
[from_quantity] => 3
[reduction] => 0.300000
[reduction_type] => percentage
[from] => 0000-00-00 00:00:00
[to] => 0000-00-00 00:00:00
[score] => 0
[quantity] => 3
[real_value] => 30
[nextQuantity] => -1
)

)

Comment puis-je le trier selon les valeurs de [reduction] ? Je ne vois pas comment appliquer array_sort() dans ce cas de figure.

Merci !