<?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);
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Value for `_results` contains invalid data `array`