Shawn McKenzie schrieb:
Daniel Brown wrote:
On Thu, Jan 22, 2009 at 15:12, Daniel Brown <danbr...@php.net> wrote:
Unfortunately, neither solution would work. isset() will return
FALSE even for an instantiated and explicitly-defined NULL variable.
Forgot to mention that, in addition, is_null() will return TRUE
for both explicitly-set NULL variables and undefined variables alike.
That's why I was testing isset() fist, however as you pointed out, that
is crap also. :-(
$testvariable1;
$testvariable2 = null;
$testvariable3 = '';
var_dump($testvariable1);
var_dump($testvariable2);
var_dump($testvariable3);
var_dump( isset( $testvariable1));
var_dump( isset( $testvariable2));
var_dump( isset( $testvariable3));
var_dump( is_null( $testvariable1));
var_dump( is_null( $testvariable2));
var_dump( is_null( $testvariable3));
NULL NULL string(0) ""
bool(false) bool(false) bool(true)
bool(true) bool(true) bool(false)
Regards
Carlos
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