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run code in 150+ php & hhvm versions
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<?php var_dump(date('c', strtotime("first Friday")), date('c', strtotime("last Friday")));
Output for 5.0.0 - 7.1.0
string(25) "2013-05-31T00:00:00+02:00" string(25) "2013-05-24T00:00:00+02:00"
Output for 4.3.0 - 4.4.9
string(1) "c" string(1) "c"