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<?php $date = sprintf('%04d-%02d', 2016, 02); $begin_date = $date . '-01'; $end_date = $date . '-' . date('t', strtotime($date . '-05')); var_dump($begin_date); var_dump($end_date);
Output for 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(10) "2016-02-01" string(10) "2016-02-29"

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225.11 ms | 403 KiB | 233 Q