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run code in 150+ php & hhvm versions
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<?php $♫ = "music"; var_dump( $♫ ); // string(5) "music" $string = "♫"; echo mb_strlen($string, '8bit'); // 3
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(5) "music" 3
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/IU76n on line 6
Process exited with code 255.