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run code in 150+ php & hhvm versions
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<?php var_dump(mb_substr('осем', 1, null, '8bit')); var_dump(mb_substr('осем', 1, 7, '8bit'));
Output for 5.4.8 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(7) "�сем" string(7) "�сем"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.3.7 - 5.4.7
string(0) "" string(7) "�сем"