From: mail at iaindooley dot com
Operating system: FreeBSD 4.7
PHP version: 4.3.4
PHP Bug Type: Variables related
Bug description: Variable assignment produces errors
Description:
------------
i'm sorry if this bug report sounds strange, but this is a very strange
bug. if it is indeed a bug. a problem with this is that in order to
reproduce the bug you would have to install all the ancestor classes to
run the code, but i think you will get a good idea of what is going wrong
from my description below. basically, this method is part of a
DBSelectQuery class that is just a convenience class for building database
queries on the fly. The particular method in question is being used in
many many other places without errors.
Reproduce code:
---------------
/**
* Add a clause to this query
* @param clause - a DBClause object
*/
function setClause($db_clause)
{
if($db_clause!="")
{
$str = $db_clause->toString();
$this->clause = $str;
}
}
Expected result:
----------------
the expected result would be that the member variable 'clause' of the
query object would now have the value of the $db_clause object's
toString() method.
Actual result:
--------------
if the code is executed as it is above, i get the error:
Fatal error: Call to a member function on a non-object in
/usr/home/iain/public_html/sitekitchen/classes/db/dbselectquery.class.inc
on line 101
Line 101 is the line with the call:
$str = $db_clause->toString();
So one would assume that $db_clause is somehow not an object. However, if
i comment out the line that assigns the variable $str to $this->clause,
then there is no error. ie. the code now looks like this:
/**
* Add a clause to this query
* @param clause - a DBClause object
*/
function setClause($db_clause)
{
if($db_clause!="")
{
$str = $db_clause->toString();
echo($str);
//$this->clause = $str;
}
}
And i get the following printed out to the screen:
WHERE functionid = '34'
which is the expected result of the $db_clause object's toString() method,
so it is clearly an object.
Please bare in mind here, that the 'Call to a member function on a
non-object" error is _not_ occuring on the line that i have commented out
above. Commenting out this line prevents the error from occuring in the
_previous_ line!!!
also, if i assign some other random string to $this->clause, ie. the code
now looks like this:
/**
* Add a clause to this query
* @param clause - a DBClause object
*/
function setClause($db_clause)
{
if($db_clause!="")
{
$str = $db_clause->toString();
echo($str);
$this->clause = "some random string";
}
}
then the code is fine (apart from the fact that the database query doesn't
work because it has the words "some random string" instead of a where
clause!)
i am also able to assign the variable $str to some other random variable,
ie:
/**
* Add a clause to this query
* @param clause - a DBClause object
*/
function setClause($db_clause)
{
if($db_clause!="")
{
$str = $db_clause->toString();
$some_random_variable = $str;
echo($str."<br>".$some_random_variable);
$this->clause = "some random string";
}
}
this gives the expected output:
WHERE functionid = '34'
WHERE functionid = '34'
i seriously feel like i am taking crazy pills. if you need some more info,
let me know.
--
Edit bug report at http://bugs.php.net/?id=27358&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=27358&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=27358&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=27358&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=27358&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=27358&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=27358&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=27358&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=27358&r=support
Expected behavior: http://bugs.php.net/fix.php?id=27358&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=27358&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=27358&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=27358&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=27358&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=27358&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=27358&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=27358&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=27358&r=float