Hello !
Is it just me or are we missing a way in the language to check if a
variable
that has been set to NULL exists or not?
is_null() on an unset variable throws a NOTICE.
$var === null throws a notice.
So, you have to use isset()? But, ah,
$var = null;
if(isset($var))
yields false.
Is array_key_exists("var", $GLOBALS) the only solution to this problem?
This question creeps up every once in a while, and I have seen
bunchload of code that uses array_key_exists("foo", $array); rather
then isset($array["foo"]) because of it.
I however have never seen a proper usecase..
class foo {
public function __call($method, $arguments)
{
// We MUST have at least ONE argument !
if (array_key_exists(0, $arguments) === false) //
isset($arguments[0]) return false if first argument has null value
{
trigger_error('First argument of method ' . $method . '()
must be defined', E_USER_ERROR);
}
...
}
}
$foo = new foo();
$foo->magicCallToMethod(null); // no error
$foo->magicCallToMethod(); // error
Best regards,
Fred
--
========================================================================
Frédéric Hardy : Architecte d'application/Admin. système/Ergonome
========================================================================
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