Bug #72774 [Opn]: Exception backtrace produces wrong integer values when passed by reference

From: Date: Sun, 07 Aug 2016 16:57:13 +0000
Subject: Bug #72774 [Opn]: Exception backtrace produces wrong integer values when passed by reference
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-203042@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=72774&edit=1

 ID:                 72774
 Updated by:         cmb@php.net
 Reported by:        eyalt@php.net
 Summary:            Exception backtrace produces wrong integer values
                     when passed by reference
 Status:             Open
 Type:               Bug
 Package:            Variables related
 Operating System:   Linux
 PHP Version:        7.0.9
-Assigned To:        
+Assigned To:        cmb
 Block user comment: N
 Private report:     N

 New Comment:

As of PHP 7.0.0 this is expected behavior, that is described in
UPGRADING[1].

I couldn't find it being listed in the migration guide in the
manual, though, so I'm switching to doc bug.

[1] <https://github.com/php/php-src/blob/PHP-7.0.0/UPGRADING#L215-L240>


Previous Comments:
------------------------------------------------------------------------
[2016-08-07 13:56:10] eyalt@php.net

Description:
------------
Exception backtrace produces wrong integer values when passed by reference - a regression VS PHP
5.x, as can be seen in the test script.

Test script:
---------------
<pre><?php
function recurse_bug($count) {
	if ($count) {
		return recurse_bug(--$count); // if we use instead $count - 1, then BT will be prodcued OK on PHP
7 too
	}
	$e = new Exception();
	print $e->getTraceAsString();
}
recurse_bug(2);
/*  On PHP 5.x we will get the correct BT:
#0 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#1 /var/www/html/frontend/scrap.php(4): recurse_bug(1)
#2 /var/www/html/frontend/scrap.php(9): recurse_bug(2)
#3 {main}

On PHP 7.x we will get the following wrong BT:
#0 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#1 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#2 /var/www/html/frontend/scrap.php(9): recurse_bug(1)
#3 {main} */

Expected result:
----------------
#0 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#1 /var/www/html/frontend/scrap.php(4): recurse_bug(1)
#2 /var/www/html/frontend/scrap.php(9): recurse_bug(2)
#3 {main}

Actual result:
--------------
#0 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#1 /var/www/html/frontend/scrap.php(4): recurse_bug(0)
#2 /var/www/html/frontend/scrap.php(9): recurse_bug(1)
#3 {main} */


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



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Edit this bug report at https://bugs.php.net/bug.php?id=72774&edit=1

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