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<?php var_dump(date('c', strtotime("next Friday", strtotime("01 May 2013"))), date('c', strtotime("last Friday", strtotime("31 May 2013"))));
Output for 5.0.5 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(25) "2013-05-03T00:00:00+02:00" string(25) "2013-05-24T00:00:00+02:00"
Output for 5.0.0 - 5.0.4
string(25) "2013-05-10T00:00:00+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"