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<?phpfunction inGroup($user, $group) {	$groupData = file_get_contents('/etc/group');	foreach(explode("\n", $groupData) as $groupLine) {		$lineData = explode(':', $groupLine);		if($lineData[0] !== $group || empty($lineData[3])) {//not the group			continue;		}		$groups = explode(',', $lineData[3]);		return in_array($user, $groups);	}}?>