input类的_sanitize_globals是什么作用？
input类是过滤get，post等输入的。function _sanitize_globals()
{
// Would kind of be "wrong" to unset any of these GLOBALS
$protected = array('_SERVER', '_GET', '_POST', '_FILES', '_REQUEST', '_SESSION', '_ENV', 'GLOBALS', 'HTTP_RAW_POST_DATA',
'system_folder', 'application_folder', 'BM', 'EXT', 'CFG', 'URI', 'RTR', 'OUT', 'IN');
// Unset globals for security.
// This is effectively the same as register_globals = off
foreach (array($_GET, $_POST, $_COOKIE, $_SERVER, $_FILES, $_ENV, (isset($_SESSION) && is_array($_SESSION)) ? $_SESSION : array()) as $global)
{
if ( ! is_array($global))
{
if ( ! in_array($global, $protected))
{
unset($GLOBALS[$global]);
}
}
else
{
foreach ($global as $key => $val)
{
if ( ! in_array($key, $protected))
{
unset($GLOBALS[$key]);
}
if (is_array($val))
{
foreach($val as $k => $v)
{
if ( ! in_array($k, $protected))
{
unset($GLOBALS[$k]);
}
}
}
}
}
}
// Is $_GET data allowed? If not we'll set the $_GET to an empty array
if ($this->allow_get_array == FALSE)
{
$_GET = array();
}
else
{
$_GET = $this->_clean_input_data($_GET);
}
// Clean $_POST Data
$_POST = $this->_clean_input_data($_POST);
// Clean $_COOKIE Data
// Also get rid of specially treated cookies that might be set by a server
// or silly application, that are of no use to a CI application anyway
// but that when present will trip our 'Disallowed Key Characters' alarm
// http://www.ietf.org/rfc/rfc2109.txt
// note that the key names below are single quoted strings, and are not PHP variables
unset($_COOKIE['$Version']);
unset($_COOKIE['$Path']);
unset($_COOKIE['$Domain']);
$_COOKIE = $this->_clean_input_data($_COOKIE);
log_message('debug', "Global POST and COOKIE data sanitized");
}
那这段函数是干什么用的?后面看得懂，对post，cookie值进行过滤，那前面呢？为if(!in_array($key,$protected)){ unset($GLOBALS[$key])}为什么？
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