Special vars: null. true, false

Stingus

Hi,
I have several vars taken from the $_GET array. The values are strings 'null' or 'true' or 'false'. When checking these vars I can't find any match using this code:

//$MyVar = 'null';

if ($MyVar == 'null')
    echo 'match'; //doesn't output

if ($MyVar == null)
    echo 'match'; //doesn't output

echo $MyVar; //outputs 'null'

//same thing with 'true' or 'false'

How can I check against these values and, furthermore, how can I directly assign the constant NULL from the string 'NULL'?

Weedpacket

How exactly are you getting from the $_GET array to $MyVar? Is it as simple as

www.example.com/script.php?myvar=null

$MyVar = $_GET['myvar'];

Stingus

It's a little more complicated procedure since I use mcrypt functions to encrypt / decrypt the vars. But basically the result is the same as your example.

I don't think it's a matter of how $_GET vars are handled because replacing the value with ordinary value (eg "1" or "val") you can make the IF check.

for example:
http://www.example.com/script.php?MyVar=null

$MyVar = $_GET['MyVar'];

if ($MyVar == 'null') { //doesn't match
}

but for http://www.example.com/script.php?MyVar=1

$MyVar = $_GET['MyVar'];

if ($MyVar == 1) { //it's a match!!!
}

Stingus

Nevermind the issue...I had some trailing spaces in the decrypted string which messed by IFs.

Thanks