3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $date = new DateTime(); $test['test'] = $date->format('Y-m'); var_dump($test);
based on bjLHr
Output for 5.4.8 - 5.4.45, 5.6.28, 7.0.20 - 7.2.0
array(1) { ["test"]=> string(7) "2015-09" }
Output for 5.5.24, 5.5.35 - 5.6.7, 5.6.21, 7.0.6
array(1) { ["test"]=> string(7) "2016-05" }
Output for 5.5.25 - 5.5.29, 5.5.34, 5.6.8 - 5.6.14, 5.6.20, 7.0.5
array(1) { ["test"]=> string(7) "2016-04" }
Output for 5.5.30 - 5.5.33, 5.6.15 - 5.6.19, 7.0.0 - 7.0.4
array(1) { ["test"]=> string(7) "2016-03" }
Output for 5.3.18 - 5.4.7
array(1) { ["test"]=> string(7) "2015-10" }