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<?php $list = [ ['second', 'stamp' => time()], ['first', 'stamp' => time() - 10000], ['fourth', 'stamp' => time() + 10000], ['third', 'stamp' => time() + 5], ]; usort($list, function($a, $b) { return $a['stamp'] - $b['stamp']; }); var_dump($list);

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