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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(pack('H*', 9223372036854775807));
Output for 5.1.2 - 7.1.0
string(10) "�#7 6�Gu�p"
Output for 4.3.0 - 5.1.1
string(1) "�"