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run code in 150+ php & hhvm versions
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<?php $string = 'test' . chr(0) . "\n" . 'test' . "\r\n" ; mb_ereg('[\0\r\n]', $string, $matches); var_dump($matches);
based on ftRjW
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(1) "" }
Output for 4.3.4 - 4.4.9
array(1) { [0]=> string(1) " " }
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_ereg() in /in/hLkLW on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_ereg() in /in/hLkLW on line 7