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run code in 200+ php & hhvm versions
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<?php $d = "aaaa\nbbbbb"; $a = preg_replace("/\n/","",$d); print $a; ?>
Output for 5.3.0 - 5.6.30, hhvm-3.10.1, hhvm-3.12.14, hhvm-3.17.3, 7.0.0 - 7.1.10
aaaabbbbb
Output for hhvm-3.11.1, hhvm-3.13.2 - 3.15.4

Process exited with code 137.