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run code in 150+ php & hhvm versions
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<?php $lastmonth = date('Y-m-01',mktime(0, 0, 0, date("m")-3, date("d"), date("Y"))); echo lastmonth ; ?>
based on jPdtA
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant lastmonth - assumed 'lastmonth' in /in/J0GFi on line 3 lastmonth