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Bug #74188 Null coalescing operator fails for undeclared static class properties
Submitted: 2017-03-01 07:42 UTC Modified: 2017-04-11 07:08 UTC
From: pandenitz at mail dot ru Assigned: tpunt (profile)
Status: Closed Package: Variables related
PHP Version: 7.0.16 OS: Win 7 64
Private report: No CVE-ID: None
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 [2017-03-01 07:42 UTC] pandenitz at mail dot ru 
Description:
------------
Null coalescing operator doesn't check isset() for static properties

Test script:
---------------
abstract class Test
{
	public static function get()
	{
		return static::$test ?? true;
	}

	public static function get2()
	{
		return isset(static::$test) ? static::$test : true;
	}
}

// Access to undeclared static property
Test::get();

// Works
Test::get2();


Expected result:
----------------
No errors

Actual result:
--------------
Error

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 [2017-03-01 13:39 UTC] requinix@php.net
-Status: Open +Status: Verified
 [2017-03-01 17:05 UTC] pandenitz at mail dot ru 
I guess it's same in PHP 7.1
 [2017-03-26 16:37 UTC] tpunt@php.net
-Assigned To: +Assigned To: tpunt
 [2017-03-27 08:10 UTC] pandenitz at mail dot ru
-Summary: Null coalescing operator issue with undeclared static class properties +Summary: Null coalescing operator fails for undeclared static class properties & constant
 [2017-03-27 08:10 UTC] pandenitz at mail dot ru 
Same for class constants.
 [2017-03-27 19:11 UTC] tpunt@php.net 
The null coalescing operator should not be used to check whether a constant has been defined or not - that's what the defined() function is for.
 [2017-03-28 06:08 UTC] pandenitz at mail dot ru 
We can use isset() for variables as well :) Why not to make it work with constants? Anyway, static class properties are more important.
 [2017-04-09 13:31 UTC] nikic@php.net
-Summary: Null coalescing operator fails for undeclared static class properties & constant +Summary: Null coalescing operator fails for undeclared static class properties
 [2017-04-10 21:21 UTC] tpunt@php.net
-Status: Verified +Status: Closed
 [2017-04-11 07:08 UTC] pandenitz at mail dot ru 
Why the issue was closed?
 [2017-04-11 13:26 UTC] tpunt@php.net 
This issue was fixed in the 7.0, 7.1, and master branches. It should therefore be in the 7.0.19 and 7.1.5 releases next month.
 
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