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run code in 200+ php & hhvm versions
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<?php $request['typ'] = array(5,9); $request['typ'] = preg_grep('/^[0-9]+$/', $request['typ']); var_dump("vt.vttypid IN ('". implode("','", $request['typ']) ."')");
based on Wnv2U
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
string(23) "vt.vttypid IN ('5','9')"