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<?php $dayZ = null; $dayZ = strtotime("monday this week", (!empty($dayZ)) ? strtotime($dayZ) : time()); var_dump(date("Y-m-d H:i:s", $dayZ));
Output for 4.3.5 - 5.0.5, 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(19) "2013-10-21 00:00:00"
Output for 4.3.0 - 4.3.4, 5.1.0 - 5.1.6
string(19) "2013-10-28 00:00:00"