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<?php $array = [ "21-07-2017" => ['a'], "04-09-2017" => ['b'], "27-07-2017" => ['c'], "31-07-2017" => ['d'], "01-08-2017" => ['e'], "05-09-2017" => ['f'], "15-09-2017" => ['g'], ]; uksort($array, function($a, $b) { return strtotime($a) <=> strtotime($b);}); var_export($array);
Output for git.master, git.master_jit, rfc.property-hooks
array ( '21-07-2017' => array ( 0 => 'a', ), '27-07-2017' => array ( 0 => 'c', ), '31-07-2017' => array ( 0 => 'd', ), '01-08-2017' => array ( 0 => 'e', ), '04-09-2017' => array ( 0 => 'b', ), '05-09-2017' => array ( 0 => 'f', ), '15-09-2017' => array ( 0 => 'g', ), )

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