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<?php $input = array( 'last day of this month', 'Last day of this month', 'lAst Day of This Month'); foreach ($input as $str) { var_dump(date('Y-m-d', strtotime($str))); }
Output for 5.5.17 - 5.5.38, 5.6.1 - 5.6.40, 7.0.0 - 7.0.33, 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) "2020-06-30" string(10) "2020-06-30" string(10) "2020-06-30"
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.16, 5.6.0
string(10) "2020-06-30" string(10) "2020-06-01" string(10) "2020-06-30"
preferences:
270.63 ms | 402 KiB | 412 Q