3v4l.org

run code in 150+ php & hhvm versions
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<?php echo date('m/d/Y', strtotime('last monday', strtotime('2014-09-15')));
based on Bd3VI
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
09/08/2014