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<?php $d1 = Datetime::createFromFormat("Y-m-d", "2017-07-30"); $tmp = clone $d1; var_dump($tmp->format('D'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(3) "Sun"