<?php $attachments = [ [ "year" => 2018, "id" => 14689 ], [ "year" => 2017, "id" => 14690 ], [ "year" => 2018, "id" => 14688 ], [ "year" => 2018, "id" => 14687 ] ]; usort($attachments, function ($first, $second) { return $first["year"] < $second["year"]; }); print_r($attachments);
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