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run code in 150+ php & hhvm versions
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<?php $timestamp = strtotime("2014-01-31"); echo date('Y/m/d', strtotime('last day of next month '.date('F', $timestamp).' '.date('Y', $timestamp)));
based on ZbgpK
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2014/02/28
Output for 4.3.0 - 5.2.17
1970/01/01