[Fwd: [PHP-DEV] PHP 4.0 Bug #6750 Updated: passing undefined variables by reference mangles function parameters] From: André Langhorst (A.Langhorst <email protected>)
Date: 09/14/00

FYI: This is a bad one.

andré

attached mail follows:

ID: 6750
Updated by: waldschrott
Reported By: dshadow <email protected>
Status: Analyzed
Bug Type: Scripting Engine problem
Assigned To:
Comments:

argh, this is really bad, what seems to happen is (verified with modified tests):

if a non-existent variable (NULL works) is passed to the referenced parameter, *all* other parameters are overwritten with the value of the precessing variable the referenced one too, what explains the current buggy behaviour at the third function call

Previous Comments:
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[2000-09-14 02:07:58] dshadow <email protected>
Passing an undefined variable or function result to a function expecting said parameter by reference mangles the function parameters.

The following script results in this output:

        SomeFunc(2, 2, 2) //this is really bad
        SomeFunc(1, 2, 1) //This is correct
        SomeFunc(1, 2, 2) //This isn't correct, but it's not good either

This bug is in PHP 4.0.2 and the 4.0.3 CVS. The earliest version I know of with the problem is a 4.0.2 CVS with a build date of Jul 21, so the problem has existed since at least then. 

---

function returnUndef() {
	return $foo;
}

function returnDef() {
	return 1;
}

function SomeFunc($a, $b, &$c) {
	echo("SomeFunc($a, $b, $c)n");
}

SomeFunc(1, 2, returnUndef());
SomeFunc(1, 2, returnDef());
SomeFunc(1, 2, $bar);

---------------------------------------------------------------------------

Full Bug description available at: http://bugs.php.net/?id=6750

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