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<?php var_dump(date('Y-m-d', strtotime(date('Y-m-01').' -1 MONTH'))); var_dump(date('Y-m-d', strtotime('first day of last month')));
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(10) "2014-02-01" string(10) "2014-02-01"
Output for 4.3.0 - 5.2.17
string(10) "2014-02-01" string(10) "1970-01-01"