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run code in 200+ php & hhvm versions
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<?php $a = 'A'; var_dump(chr(ord($a) + 5));
based on 2jtKa
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(1) "F"