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Bug #49472 Constants defined in Interfaces can be overridden
Submitted: 2009-09-05 10:08 UTC Modified: 2009-12-03 12:35 UTC
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: phil at mossyvale dot co dot uk Assigned: felipe
Status: Closed Package: Scripting Engine problem
PHP Version: 5.*, 6 OS: *
Private report: No CVE-ID:
 [2009-09-05 10:08 UTC] phil at mossyvale dot co dot uk
If an interface defines a constant and is then implemented by a class which is then extended with a further class and both classes implement the interface, the second class may override the interface constant without a fatal error. Also present in 5.2.10 on FreeBSD 7.2

Reproduce code:
From manual page: language.oop5.interfaces

Expected result:
Fatal error:  Cannot inherit previously-inherited constant c from interface ia ... on line 18

Actual result:
Program outputs "OceanSea" which indicates that the interface constant is still available but the class constant with the same name overrides it.


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 [2009-09-13 18:47 UTC]

interface ia {
    const c = 'Sea';

class Foo implements ia {
	// const c = "Lake";  
	// Attempting to override ia's constant c in
	// this class triggers a fatal error.

class FooBar extends Foo implements ia {
	const c = 'Ocean'; // No error, class constant
	 		   // overriding ia's definition.
	public function show(){
		// ia's definition is still accessible.
	  return ia::c;

$i = new FooBar;
echo FooBar::c;
echo $i->show();

 [2009-12-03 12:34 UTC]
Automatic comment from SVN on behalf of felipe
Log: - Fixed bug #49472 (Constants defined in Interfaces can be overridden)
 [2009-12-03 12:35 UTC]
This bug has been fixed in SVN.

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