[PHP-BUG] Bug #74350 [NEW]: defined() not working for $objectinstance::CLASS_CONSTANT

From:             Andy_Schmidt at HM-Software dot com
Operating system: Windows
PHP version:      7.1.3
Package:          Class/Object related
Bug Type:         Bug
Bug description:defined() not working for $objectinstance::CLASS_CONSTANT 

Description:
------------
defined() will function correctly for class constants, if either the
class name or a classname variable is used.

However, if one tries to check the existence of a constant of the class
that was used to instantiate the object, then it will return "not
defined".

Test script:
---------------
class Class_A
{
	const CONST_A = 'value A';
	//    CONST_B not defined
}

$class_name = Class_A::class;

$object_A = new $class_name();

// Class references work correctly!
if ( defined( 'Class_A::CONST_A' ) )
	echo 'Class_A::CONST_A defined';

if ( defined( $class_name.'::CONST_A' ) )
	echo '$class_name::CONST_A defined';

if ( !defined( 'Class_A::CONST_B' ) )
	echo 'No Class_A::CONST_B';
		
if ( !defined( $class_name.'::CONST_B' ) )
	echo 'No $class_name::CONST_B';
			

echo $object_A::CONST_A;	// As expected, result: "value A" ! ****

// ***** Yet, using that object reference will report "not" defined!
*****
if ( defined( '$object_A::CONST_A' ) )
	echo '$object_A::CONST_A defined !!';
else
	echo 'no $object_A::CONST_A';


// PS: As expected, "Fatal Error: Object of class Class_A could not be
converted to string"
if ( defined( "$object_A::CONST_A" ) )
 	echo 'Should cause error, and does';

if ( defined( $object_A.'::CONST_A' ) )
 	echo 'Should cause error, and does';

Expected result:
----------------
Class_A::CONST_A defined
$class_name::CONST_A defined
No Class_A::CONST_B
No $class_name::CONST_B

value A
$object_A::CONST_A defined!!



Actual result:
--------------
Class_A::CONST_A defined
$class_name::CONST_A defined
No Class_A::CONST_B
No $class_name::CONST_B

value A
no $object_A::CONST_A

-- 
Edit bug report at https://bugs.php.net/bug.php?id=74350&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=74350&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=74350&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=74350&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=74350&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=74350&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=74350&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=74350&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=74350&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=74350&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=74350&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=74350&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=74350&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=74350&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74350&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=74350&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=74350&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=74350&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=74350&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=74350&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=74350&r=mysqlcfg