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run code in 200+ php & hhvm versions
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<?php exec("whois " . escapeshellarg("mikote.net") . " 2>&1", $retType); var_dump($retType);
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.3.0rc3
array(0) { }
Output for hhvm-3.15.4
array(1) { [0]=> string(41) "Failed to exec: `whois 'mikote.net' 2>&1'" }