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<?php $array = [ [ "offer_id" => 62122, "quantity" => 1 ], [ "offer_id" => 62123, "quantity" => 2 ], [ "offer_id" => 62124, "quantity" => 2 ] ]; print_r(array_column($array, 'quantity', 'offer_id'));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [62122] => 1 [62123] => 2 [62124] => 2 )

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