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<?phpfunction inGroup($user, $group) {	$groupData = file_get_contents('/etc/group');	foreach(explode("\n", $groupData) as $groupLine) {		if(substr($groupLine, 0, strpos($groupLine, ':')) !== $group) {			continue;		}		$lineData = explode(':', $groupLine);		if(empty($lineData[3])) {			return false;		}		return in_array($user, explode(',', $lineData[3]));	}}?>