Hello!
i might have found a problem dealing with 0 and NULL values while using a recursive function in a class that i have created.

I have found some bugs related to this problem in the php-bugs database about "0" and "NULL", but the problem i have found goes more into depth: i've noticed that 0 == NULL only if the value "0" only if the value "0" comes from the array passed to the recurvise function. i try to explain with an example:

$temp = $a[$p];

if ($temp == "") {
 if ($temp == "0") {
  echo ("impossible");
 }
}

it happens that the output will be "impossible".

instead, if i set $temp = "0" or NULL before the IF structures, i won't get the output "impossible":

$temp = $a[$p];

$temp = "0";
   // or  $temp = NULL;
   // or without declaring at all the variable $temp

if ($temp == "") {
 if ($temp == "0") {
  echo ("Impossible");
 }
}



$a is an array which can be modified or not by the recursive function, and is then passed as a parameter to the function itself

I have tested it both with version 4.0.5 and 4.2.0

If you would like to receive more details about this, i will be glad to send you the complete source code. i have tried to reduce the lenght of the code, anyway it's still too long to write here. if you are interested, i could send you all the code by email or i could give you an account to access my server and work by ftp/http

best regards,
and thank you for developing PHP :)
Claudo Frizziero

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