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run code in 200+ php & hhvm versions
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<?php var_dump(date("Y-m-d H:i:s", strtotime("monday 2013-10-25")));
Output for 5.1.0 - 7.1.7
string(19) "2013-10-28 00:00:00"
Output for 4.3.0 - 5.0.5
string(19) "2013-10-25 00:00:00"