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Bug #69889 Null coalesce operator doesn't work for string offsets
Submitted: 2015-06-20 12:16 UTC Modified: 2015-06-20 13:33 UTC
From: me at kelunik dot com Assigned: nikic (profile)
Status: Closed Package: *General Issues
PHP Version: 7.0.0alpha1 OS:
Private report: No CVE-ID: None
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 [2015-06-20 12:16 UTC] me at kelunik dot com 
Description:
------------
http://3v4l.org/lsoFA

Test script:
---------------
<?php

$foo = "test";

var_dump($foo[0] ?? "default");
var_dump($foo[5] ?? "default");
var_dump(isset($foo[5]) ? $foo[5] : "default");

Expected result:
----------------
string(1) "t"
string(7) "default"
string(7) "default"

Actual result:
--------------
string(1) "t"
string(0) ""
string(7) "default"

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 [2015-06-20 13:04 UTC] laruence@php.net 
the problem is foo[5] returns a empty string, later in ZEND_COALESCE operands, it have no idea it whether it is a valid return..

instead of change uninitlized offset from empty string to IS_NULL(BC break?), we could also introduce a CG(error_empty_string) use in such case..

thanks
 [2015-06-20 13:09 UTC] nikic@php.net
-Assigned To: +Assigned To: nikic
 [2015-06-20 13:12 UTC] nikic@php.net 
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=9fa70dbd29f91c9ae9360f19c63ada18268f5b17
Log: Fixed bug #69889
 [2015-06-20 13:12 UTC] nikic@php.net
-Status: Assigned +Status: Closed
 [2015-06-20 13:25 UTC] laruence@php.net 
great, I was thinking of make a PR (since BC break).. anyway, I agree this is the best way to deal with it..
 [2015-06-20 13:33 UTC] laruence@php.net 
hmm, I was thinking return IS_NULL in all mode.. your fix has no bc break. :)
 [2015-06-23 18:04 UTC] ab@php.net 
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=9fa70dbd29f91c9ae9360f19c63ada18268f5b17
Log: Fixed bug #69889
 [2016-07-20 11:38 UTC] davey@php.net 
Automatic comment on behalf of nikic
Revision: http://git.php.net/?p=php-src.git;a=commit;h=9fa70dbd29f91c9ae9360f19c63ada18268f5b17
Log: Fixed bug #69889
 
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