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run code in 150+ php & hhvm versions
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<?php preg_match_all('%/\*(.*)\*/%U', '/* */ /* */', $matches); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> array(2) { [0]=> string(5) "/* */" [1]=> string(5) "/* */" } [1]=> array(2) { [0]=> string(1) " " [1]=> string(1) " " } }
Output for hhvm-3.10.0

Process exited with code 153.