From: [EMAIL PROTECTED]
Operating system: Red Hat 6.2
PHP version: 4.2.0
PHP Bug Type: Scripting Engine problem
Bug description: 0 == NULL, but only sometimes! :)
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
---
configure line:
configure --with-mysql --with-apxs=/usr/local/apache/bin/apxs
--with-jpeg-dir=/usr/local/bin --with-gd=/usr/ --enable-ftp
--
Edit bug report at http://bugs.php.net/?id=16955&edit=1
--
Fixed in CVS: http://bugs.php.net/fix.php?id=16955&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=16955&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=16955&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=16955&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=16955&r=support
Expected behavior: http://bugs.php.net/fix.php?id=16955&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=16955&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=16955&r=submittedtwice
