I'm looking for the best way how to use external variables in PHP with error level including E_NOTICE
.
I have three possible ways, I would be happy, if you can give some hints on each or suggest a different approach that YOU like.
class WebApp { public static function _GET($Index) { if (isset($_GET[$Index])) { return $_GET[$Index]; } else { return NULL; } } } // E_NOTICE, does not throw a notice: echo WebApp::_GET('ID'); // E_NOTICE, throws a notice: echo $_GET['ID'];
2.
class RequestSanitizer { const V_INTEGER = 1; const V_STRING = 2; const V_REAL = 3; public static function Sanitize($arr) { foreach ($arr as $key => $val) { if (array_key_exists($key, $_GET)) { switch ($val) { case RequestSanitizer::V_INTEGER: $_GET[$key] = $_GET[$key] + 0; break; case RequestSanitizer::V_STRING: $_GET[$key] = $_GET[$key] + ''; break; case RequestSanitizer::V_REAL: $_GET[$key] = $_GET[$key] + 0; break; } } else { $_GET[$key] = null; } } } } RequestSanitizer::Sanitize(array( 'GraphID' => RequestSanitizer::V_INTEGER, 'UserName' => RequestSanitizer::V_STRING, 'Password' => RequestSanitizer::V_STRING, 'Price' => RequestSanitizer::V_REAL )); echo $_GET['GraphID'];
3.
if (isset($_GET['ID']) && ($_GET['ID']+0>0)) { echo $_GET['ID'] }
I would use
if (isset($_GET['ID']) && ($_GET['ID']+0>0)) {
echo (int)$_GET['ID']
}
with a casting to integer (int)
. If the value must be an integer.
i'd use a Request class that encapsulates all Php "superglobals" and provides methods like "param()", "numParam()", "arrayParam()" and so on.
$req = new Request();
$user_id = $req->numParam('id');
// user_id is guaranteed to be a valid integer or 0
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