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run code in 200+ php & hhvm versions
Bugs & Features
<?php $functions=get_defined_functions(); echo $functions[2019];
Output for 5.3.0 - 7.2.0
Notice: Undefined offset: 2019 in /in/j0djW on line 4
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 2019 in /in/j0djW on line 4