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run code in 200+ php & hhvm versions
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<?php var_dump(strftime('%Y-%m-%d', strtotime('monday this week')));
based on b8ncf
Output for 5.3.22 - 5.6.38, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.3.0
string(10) "2016-01-18"