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run code in 200+ php & hhvm versions
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<?php preg_match_all( '/\X/u' , "\xE1\x8D\x9F" , $matches , PREG_SET_ORDER ); print_r($matches); exit(0);
Output for 5.3.24 - 5.3.29, 5.4.14 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.1.7
Array ( [0] => Array ( [0] => ፟ ) )
Output for 5.3.0 - 5.3.23, 5.4.0 - 5.4.13
Array ( )