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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(explode(' ', null));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1, 7.0.0 - 7.2.0
array(1) { [0]=> string(0) "" }
Output for hhvm-3.11.1, hhvm-3.13.2 - 3.17.3
Warning: explode() expects parameter 2 to be string, null given in /in/SacpG on line 2 NULL
Output for hhvm-3.12.14

Process exited with code 137.