bug symfony#17320 [Debug] Fixed erroneous deprecation notice for extended Interfaces (peterrehm)

This PR was merged into the 2.8 branch.

Discussion
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[Debug] Fixed erroneous deprecation notice for extended Interfaces

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#16643, symfony#16775
| License       | MIT
| Doc PR        | -

Replaces symfony#16775.

Commits
-------

5f4e968 Fixed erroneous deprecation notice for extended Interfaces

Author: nicolas-grekas

src/Symfony/Component/Debug/DebugClassLoader.php

@@ -200,8 +200,25 @@ public function loadClass($class)
                         @trigger_error(sprintf('The %s class extends %s that is deprecated %s', $name, $parent->name, self::$deprecated[$parent->name]), E_USER_DEPRECATED);
                     }
 
+                    $parentInterfaces = array();
+                    $deprecatedInterfaces = array();
+                    if ($parent) {
+                        foreach ($parent->getInterfaceNames() as $interface) {
+                            $parentInterfaces[$interface] = 1;
+                        }
+                    }
+
                     foreach ($refl->getInterfaceNames() as $interface) {
-                        if (isset(self::$deprecated[$interface]) && strncmp($ns, $interface, $len) && !($parent && $parent->implementsInterface($interface))) {
+                        if (isset(self::$deprecated[$interface]) && strncmp($ns, $interface, $len)) {
+                            $deprecatedInterfaces[] = $interface;
+                        }
+                        foreach (class_implements($interface) as $interface) {
+                            $parentInterfaces[$interface] = 1;
+                        }
+                    }
+
+                    foreach ($deprecatedInterfaces as $interface) {
+                        if (!isset($parentInterfaces[$interface])) {
                             @trigger_error(sprintf('The %s %s %s that is deprecated %s', $name, $refl->isInterface() ? 'interface extends' : 'class implements', $interface, self::$deprecated[$interface]), E_USER_DEPRECATED);
                         }
                     }

src/Symfony/Component/Debug/Tests/DebugClassLoaderTest.php

@@ -203,6 +203,28 @@ public function provideDeprecatedSuper()
         );
     }
 
+    public function testInterfaceExtendsDeprecatedInterface()
+    {
+        set_error_handler('var_dump', 0);
+        $e = error_reporting(0);
+        trigger_error('', E_USER_NOTICE);
+
+        class_exists('Test\\'.__NAMESPACE__.'\\NonDeprecatedInterfaceClass', true);
+
+        error_reporting($e);
+        restore_error_handler();
+
+        $lastError = error_get_last();
+        unset($lastError['file'], $lastError['line']);
+
+        $xError = array(
+            'type' => E_USER_NOTICE,
+            'message' => '',
+        );
+
+        $this->assertSame($xError, $lastError);
+    }
+
     public function testDeprecatedSuperInSameNamespace()
     {
         set_error_handler('var_dump', 0);
@@ -289,6 +311,8 @@ public function findFile($class)
             eval('namespace Test\\'.__NAMESPACE__.'; class DeprecatedParentClass extends \\'.__NAMESPACE__.'\Fixtures\DeprecatedClass {}');
         } elseif ('Test\\'.__NAMESPACE__.'\DeprecatedInterfaceClass' === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class DeprecatedInterfaceClass implements \\'.__NAMESPACE__.'\Fixtures\DeprecatedInterface {}');
+        } elseif ('Test\\'.__NAMESPACE__.'\NonDeprecatedInterfaceClass' === $class) {
+            eval('namespace Test\\'.__NAMESPACE__.'; class NonDeprecatedInterfaceClass implements \\'.__NAMESPACE__.'\Fixtures\NonDeprecatedInterface {}');
         } elseif ('Test\\'.__NAMESPACE__.'\Float' === $class) {
             eval('namespace Test\\'.__NAMESPACE__.'; class Float {}');
         }

src/Symfony/Component/Debug/Tests/Fixtures/NonDeprecatedInterface.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Symfony\Component\Debug\Tests\Fixtures;
+
+interface NonDeprecatedInterface extends DeprecatedInterface
+{
+}