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Bug #64276 Traits changed behaviour on importing conflicting properties
Submitted: 2013-02-22 13:11 UTC Modified: 2013-10-15 11:54 UTC
From: r dot wilczek at web-appz dot de Assigned:
Status: No Feedback Package: Reflection related
PHP Version: 5.4.12 OS: Linux x86_64
Private report: No CVE-ID: None
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 [2013-02-22 13:11 UTC] r dot wilczek at web-appz dot de
Description:
------------
with PHP 5.4.12 (or 5.4.11), PHP silently changed it's behaviour on importing conflicting properties from traits.

Below are PHPUnit-Testcases, which all pass on PHP 5.4.10 and fail on PHP 5.4.12:

Test script:
---------------
public function testTraitOverwritesClassPropertiesOnConflict()
{
    // Temporarily disable E_STRICT
    $oldLevel = error_reporting();
    error_reporting($oldLevel ^ E_STRICT);

    $trait = 'trait %1$s {
       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $importer = 'class %1$s {
       use %2$s;

       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $traitName    = 'trait' . uniqid();
    $importerName = 'importer' . uniqid();


    eval(sprintf($trait, $traitName));
    eval(sprintf($importer, $importerName, $traitName));

    $importerFoo = new \ReflectionProperty($importerName, 'foo');
    $traitFoo    = new \ReflectionProperty($traitName, 'foo');

    try {
        $this->assertSame(
            $traitFoo->getDocComment(), $importerFoo->getDocComment()
        );
        // reenable E_STRICT on success
        error_reporting($oldLevel);
    } catch (\PHPUnit_Framework_AssertionFailedError $e) {
        // reenabe E_STRICT on failure
        error_reporting($oldLevel);
        throw $e;
    }
}

public function testTraitOverwritesTraitPropertiesOnConflict()
{
    // Temporarily disable E_STRICT
    $oldLevel = error_reporting();
    error_reporting($oldLevel ^ E_STRICT);

    $trait = 'trait %1$s {
       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $importer = 'trait %1$s {
       use %2$s;

       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $traitName    = 'trait' . uniqid();
    $importerName = 'importer' . uniqid();

    eval(sprintf($trait, $traitName));
    eval(sprintf($importer, $importerName, $traitName));

    $importerFoo = new \ReflectionProperty($importerName, 'foo');
    $traitFoo    = new \ReflectionProperty($traitName, 'foo');

    try {
        $this->assertSame(
            $traitFoo->getDocComment(), $importerFoo->getDocComment()
        );
        // reenable E_STRICT on success
        error_reporting($oldLevel);
    } catch (\PHPUnit_Framework_AssertionFailedError $e) {
        // reenabe E_STRICT on failure
        error_reporting($oldLevel);
        throw $e;
    }
}

public function testLastUsedTraitWinsOnConflictingProperties()
{
    // Temporarily disable E_STRICT
    $oldLevel = error_reporting();
    error_reporting($oldLevel ^ E_STRICT);

    $traitA = 'trait %1$s {
       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $traitB = 'trait %1$s {
       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $importer = 'class %1$s {
       use %2$s, %3$s; // traitB wins, because it is listed as last trait.

       /**
        * Comes from %1$s
        */
       private $foo;
    }';

    $traitAName    = 'traitA' . uniqid();
    $traitBName    = 'traitB' . uniqid();
    $importerName = 'importer' . uniqid();

    eval(sprintf($traitA, $traitAName));
    eval(sprintf($traitB, $traitBName));
    eval(sprintf($importer, $importerName, $traitAName, $traitBName));

    $importerFoo = new \ReflectionProperty($importerName, 'foo');
    $traitAFoo    = new \ReflectionProperty($traitAName, 'foo');
    $traitBFoo    = new \ReflectionProperty($traitBName, 'foo');

    try {
        $this->assertSame(
            $traitBFoo->getDocComment(), $importerFoo->getDocComment()
        );
        // reenable E_STRICT on success
        error_reporting($oldLevel);
    } catch (\PHPUnit_Framework_AssertionFailedError $e) {
        // reenabe E_STRICT on failure
        error_reporting($oldLevel);
        throw $e;
    }
}


Expected result:
----------------
OK (3 tests, 3 assertions)

Actual result:
--------------
There were 3 failures:

1) Test::testTraitOverwritesClassPropertiesOnConflict
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
 /**
-        * Comes from trait51276de9547be
+        * Comes from importer51276de95480e
         */

/tmp/Test.php:212

2) Test::testTraitOverwritesTraitPropertiesOnConflict
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
 /**
-        * Comes from trait51276de9555e4
+        * Comes from importer51276de955645
         */

/tmp/Test.php:258

3) Test::testLastUsedTraitWinsOnConflictingProperties
Failed asserting that two strings are identical.
--- Expected
+++ Actual
@@ @@
 /**
-        * Comes from traitB51276de955ef1
+        * Comes from importer51276de955f43
         */

/tmp/Test.php:316

FAILURES!
Tests: 3, Assertions: 3, Failures: 3.


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History

AllCommentsChangesGit/SVN commitsRelated reports
 [2013-02-22 15:36 UTC] laruence@php.net
-Status: Open +Status: Feedback
 [2013-02-22 15:36 UTC] laruence@php.net
Please try using this snapshot:

  http://snaps.php.net/php5.4-latest.tar.gz
 
For Windows:

  http://windows.php.net/snapshots/


 [2013-10-15 11:54 UTC] php-bugs at lists dot php dot net
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
 
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