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run code in 200+ php & hhvm versions
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<?php $test = "module.firewall.asdfasdfasd"; var_dump(substr_replace($test, '', 0, strlen('module.')));
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.17.3, 7.0.0 - 7.2.0
string(20) "firewall.asdfasdfasd"