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run code in 150+ php & hhvm versions
Bugs & Features
<?php $days = array('2'); var_dump(array_filter($days, 'alter_days')); function alter_days($day) { return 'bla'; }
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(1) "2" }
Output for hhvm-3.10.0

Process exited with code 153.