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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump( preg_replace( '/foo/u', 'bar', "\xED\xA0\x81\xED\xB0\x80" ) );
Output for 5.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
NULL
Output for hhvm-3.12.14

Process exited with code 137.