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run code in 150+ php & hhvm versions
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<?php var_dump(unpack('H*', "\n"));
based on tnh9N
Output for 4.3.5 - 4.3.9, 4.3.11 - 4.4.1, 4.4.3 - 5.0.2, 5.0.5 - 5.1.1, 5.1.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> string(2) "0a" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2, 5.1.2
array(1) { [1]=> string(3) "0a0" }
Output for 4.3.10, 5.0.3 - 5.0.4
Warning: unpack(): Type H: outside of string in /in/uXCHh on line 2 array(1) { [1]=> string(2) "0a" }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> string(2) "0a" }