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<?php var_dump((new \DateTime($row->timestamp))->format('U.u'));
Output for 7.3.0rc3
Notice: Undefined variable: row in /in/lXCZ7 on line 3 Notice: Trying to get property 'timestamp' of non-object in /in/lXCZ7 on line 3 string(17) "1540212611.004141"