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run code in 150+ php & hhvm versions
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<?php $days = array('2'); function alter_days($day) { return 'bla'; } var_dump(array_walk($days, 'alter_days'));
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(true)