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run code in 150+ php & hhvm versions
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<?php var_dump( date('d.m.Y',strtotime('last day of this month')), date('d.m.Y',strtotime('Last day of this month')), date('d.m.Y',strtotime('lAst Day of This Month')) );
Output for 5.5.18 - 5.5.38, 5.6.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(10) "31.05.2014" string(10) "31.05.2014" string(10) "31.05.2014"
Output for 5.3.0 - 5.5.16, 5.6.0
string(10) "31.05.2014" string(10) "01.05.2014" string(10) "31.05.2014"
Output for 4.3.0 - 5.2.17
string(10) "01.01.1970" string(10) "01.01.1970" string(10) "01.01.1970"