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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match("//u", "\xE4B880\xE4B880", $matches)); var_dump($matches); var_dump(preg_match("//u", "\xF0A0808B", $matches)); var_dump($matches); var_dump(preg_match("//u", "𠀋", $matches)); var_dump($matches);
based on 8kbXF
Output for 5.3.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) array(0) { } bool(false) array(0) { } int(1) array(1) { [0]=> string(0) "" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.5 - 5.3.3
int(0) array(0) { } int(0) array(0) { } int(1) array(1) { [0]=> string(0) "" }
Output for 4.3.0 - 4.3.4
int(1) array(1) { [0]=> string(0) "" } int(1) array(1) { [0]=> string(0) "" } int(1) array(1) { [0]=> string(0) "" }