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run code in 200+ php & hhvm versions
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<?php var_dump((new \DateTime())->modify('monday this week'));
based on 9W5jb
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
object(DateTime)#1 (3) { ["date"]=> string(26) "2017-07-10 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "Europe/Amsterdam" }