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run code in 150+ php & hhvm versions
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<?php $dayZ = null; $dayZ = strtotime("monday this week", (strtotime($dayZ) || time())); var_dump(date("Y-m-d H:i:s", $dayZ));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(19) "1969-12-29 00:00:00"
Output for 5.1.0 - 5.2.17
string(19) "1970-01-05 00:00:00"
Output for 5.0.1 - 5.0.5
Warning: strtotime(): Called with an empty time parameter. in /in/CsdAh on line 3 string(19) "1970-01-05 00:00:00"
Output for 4.3.5 - 5.0.0
Notice: strtotime(): Called with empty time parameter in /in/CsdAh on line 3 string(19) "1970-01-05 00:00:00"
Output for 4.3.2 - 4.3.4
Notice: strtotime(): Called with empty time parameter in /in/CsdAh on line 3 string(19) "1970-01-12 00:00:00"
Output for 4.3.0 - 4.3.1
Notice: strtotime() [http://www.php.net/function.strtotime]: Called with empty time parameter in /in/CsdAh on line 3 string(19) "1970-01-12 00:00:00"