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Bug #76451 Aliases during inheritance type checks affected by opcache
Submitted: 2018-06-11 20:07 UTC Modified: 2019-05-24 11:00 UTC
Avg. Score:4.3 ± 0.5
Reproduced:1 of 2 (50.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: Assigned: nikic (profile)
Status: Closed Package: Scripting Engine problem
PHP Version: master-Git-2018-06-11 (Git) OS:
Private report: No CVE-ID: None
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 [2018-06-11 20:07 UTC]
If type-equality checks during inheritance fail on simple string comparison, they fall back to loaded the class entries and comparing those. This allows aliased classes to pass inheritance checks.

However, if classes are early-bound, then the alias will not be available if opcache is used, as compilation is isolated.

The attached test script will work without opcache and fail with opcache.

Test script:
// file1.php
class Foo {}
class_alias('Foo', 'Bar');
require __DIR__ . '/file2.php';

// file2.php
class A {
    public function test(Foo $foo) {}
class B extends A {
    public function test(Bar $foo) {}

Expected result:
No error.

Actual result:
Warning: Declaration of B::test(Bar $foo) should be compatible with A::test(Foo $foo)


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 [2019-05-09 09:18 UTC]
-Assigned To: +Assigned To: nikic
 [2019-05-24 11:00 UTC]
-Status: Assigned +Status: Closed
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