From:             oliver at x10 dot pe
Operating system: Xubuntu 12.10 64bits
PHP version:      master-Git-2013-06-30 (Git)
Package:          Class/Object related
Bug Type:         Bug
Bug description:segfault when __toString() returns "$this"

Description:
------------
Hi,

Casting $this as string inside __toString() magic function makes php crash.
It 
seems it ran into an infinite loop. 

Tested on PHP 5.5 and 5.4.11, even 5.3.6

Test script:
---------------
class base {
    function __toString() {
        return "$this";
    }
}
echo new base();

Expected result:
----------------
Exception thrown, or an error message.

Actual result:
--------------
Violación de segmento (`core' generado)

[Segmentation Fault ('core' dumped)]

-- 
Edit bug report at https://bugs.php.net/bug.php?id=65168&edit=1
-- 
Try a snapshot (PHP 5.4):   
https://bugs.php.net/fix.php?id=65168&r=trysnapshot54
Try a snapshot (PHP 5.3):   
https://bugs.php.net/fix.php?id=65168&r=trysnapshot53
Try a snapshot (trunk):     
https://bugs.php.net/fix.php?id=65168&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=65168&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=65168&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=65168&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=65168&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=65168&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=65168&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=65168&r=notwrong
Not enough info:            
https://bugs.php.net/fix.php?id=65168&r=notenoughinfo
Submitted twice:            
https://bugs.php.net/fix.php?id=65168&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=65168&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=65168&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=65168&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=65168&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=65168&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=65168&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=65168&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=65168&r=mysqlcfg

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