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run code in 150+ php & hhvm versions
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<?php $string = '$𝄞𝄞'; $array = str_split($string); var_dump(mb_strcut($string, 0, 7)); var_dump(mb_strcut($string, 0, 7, 'latin1'));
based on PQQaB
Output for 5.6.7 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "$𝄞" string(7) "$𝄞�"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.5.35
string(7) "$𝄞�" string(7) "$𝄞�"
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: str_split() in /in/IYtZR on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: str_split() in /in/IYtZR on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: str_split() in /in/IYtZR on line 4