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run code in 150+ php & hhvm versions
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<?php var_dump(preg_match('//u', "\xF0A0808A")); var_dump(mb_convert_encoding('𠀋 ', 'byte4be', 'UTF-8'));
based on ci75K
Output for 5.3.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) string(8) " "
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.5 - 5.3.3
int(0) string(8) " "
Output for 4.3.0 - 4.3.4
int(1) string(8) " "