Bug #70514 [Com]: isset(aClass::ARRAY[$a]) is mistaken for an expression
| From: | feilengcui at gmail dot com | Date: | Thu, 17 Sep 2015 01:18:02 +0000 |
| Subject: | Bug #70514 [Com]: isset(aClass::ARRAY[$a]) is mistaken for an expression | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-196049@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=70514&edit=1
ID: 70514
Comment by: feilengcui at gmail dot com
Reported by: dams@php.net
Summary: isset(aClass::ARRAY[$a]) is mistaken for an
expression
Status: Open
Type: Bug
Package: Class/Object related
Operating System: OSX, Debian
PHP Version: 7.0.0RC2
Block user comment: N
Private report: N
New Comment:
hello,I just test your code for 7.0RC1 and 7.0RC2, and I find that
if(isset(aClass::X[$a]))
if(isset(X[$a]))
are both OK and output "5 doesn't exists"
but for
if(isset(aClass::$X[$a]))
it reports an error
"Fatal error: Uncaught EngineException: Access to undeclared static property: W::$X"
Previous Comments:
------------------------------------------------------------------------
[2015-09-16 18:39:31] dams@php.net
Description:
------------
Since PHP 5.6, constants may be arrays (class or global constants). However, isset() recognize them
as 'expressions' and produces a fatal error.
if (isset(aClass::X[$a]))
if (isset(X[$a]))
On the other hand, PHP accepts :
if (isset(aClass::$X[$a]))
The behavior is in PHP 5.6 till PHP 7.0RC2 (and I tried PHP 7.1.0-dev this afternoon).
Test script:
---------------
<?php
class W {
const X = [1 => 2, 3 => 4];
public function f() {
$a = 5;
if (isset(static::X[$a])) {
print "$a exists\n";
} else {
print "$a doesn't exists\n";
}
}
}
$x = new X;
$x->f();
Expected result:
----------------
if (isset(aClass::X[$a]))
if (isset(X[$a]))
works just like
if (isset(aClass::$X[$a]))
Actual result:
--------------
The error :
PHP Fatal error: Cannot use isset() on the result of an expression (you can use "null !==
expression" instead) in /Users/famille/Desktop/analyze/test.php on line 9
Fatal error: Cannot use isset() on the result of an expression (you can use "null !==
expression" instead) in /Users/famille/Desktop/analyze/test.php on line 9
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=70514&edit=1