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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 ', 'HTML-ENTITIES', 'UTF-8'));
based on hQ4tB
Output for 5.3.4 - 7.1.0
bool(false) string(10) "&#131083; "
Output for 4.3.5 - 5.0.0, 5.0.4 - 5.3.3
int(0) string(10) "&#131083; "
Output for 5.0.1 - 5.0.3
int(0)
Process exited with code 139.
Output for 4.3.0 - 4.3.4
int(1) string(10) "&#131083; "