jenkins-bot has submitted this change and it was merged. ( 
https://gerrit.wikimedia.org/r/405925 )

Change subject: ExtensionRegistry: Properly detect if a global is already set
......................................................................


ExtensionRegistry: Properly detect if a global is already set

$foo = null; isset( $foo ); will yield false.

Sometimes we want to explicitly set a config to null, but ExtensionRegistry
is then overriding this variable with the default value.

This is no consistent with the old workflow:
require_once the extension and then override the setting with null.

Bug: T128661
Change-Id: I0654c9369a596e84591fcaa9643703e6b4ccf57e
---
M includes/registration/ExtensionRegistry.php
M tests/phpunit/includes/registration/ExtensionRegistryTest.php
2 files changed, 13 insertions(+), 1 deletion(-)

Approvals:
  Legoktm: Looks good to me, approved
  jenkins-bot: Verified



diff --git a/includes/registration/ExtensionRegistry.php 
b/includes/registration/ExtensionRegistry.php
index 6308461..ae1ab58 100644
--- a/includes/registration/ExtensionRegistry.php
+++ b/includes/registration/ExtensionRegistry.php
@@ -291,7 +291,7 @@
 
                        // Optimistic: If the global is not set, or is an empty 
array, replace it entirely.
                        // Will be O(1) performance.
-                       if ( !isset( $GLOBALS[$key] ) || ( is_array( 
$GLOBALS[$key] ) && !$GLOBALS[$key] ) ) {
+                       if ( !array_key_exists( $key, $GLOBALS ) || ( is_array( 
$GLOBALS[$key] ) && !$GLOBALS[$key] ) ) {
                                $GLOBALS[$key] = $val;
                                continue;
                        }
diff --git a/tests/phpunit/includes/registration/ExtensionRegistryTest.php 
b/tests/phpunit/includes/registration/ExtensionRegistryTest.php
index 9b57e1c..5916b45 100644
--- a/tests/phpunit/includes/registration/ExtensionRegistryTest.php
+++ b/tests/phpunit/includes/registration/ExtensionRegistryTest.php
@@ -287,6 +287,18 @@
                                        ],
                                ],
                        ],
+                       [
+                               'global is null before',
+                               [
+                                       'NullGlobal' => null,
+                               ],
+                               [
+                                       'NullGlobal' => 'not-null'
+                               ],
+                               [
+                                       'NullGlobal' => null
+                               ],
+                       ],
                ];
        }
 }

-- 
To view, visit https://gerrit.wikimedia.org/r/405925
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Gerrit-MessageType: merged
Gerrit-Change-Id: I0654c9369a596e84591fcaa9643703e6b4ccf57e
Gerrit-PatchSet: 1
Gerrit-Project: mediawiki/core
Gerrit-Branch: master
Gerrit-Owner: Hoo man <[email protected]>
Gerrit-Reviewer: Addshore <[email protected]>
Gerrit-Reviewer: Legoktm <[email protected]>
Gerrit-Reviewer: Reedy <[email protected]>
Gerrit-Reviewer: jenkins-bot <>

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