Update to MW 1.42

includes/IsekaiOIDCAuth.php

@@ -266,13 +266,11 @@ class IsekaiOIDCAuth extends AbstractPrimaryAuthenticationProvider {
         }
         if ( isset( $config['scope'] ) ) {
             $scope = $config['scope'];
-            if ( is_array( $scope ) ) {
+            if ( ! is_array( $scope ) ) {
-                foreach ( $scope as $s ) {
+                $scope = [ $scope ];
-                    $oidc->addScope( $s );
-                }
-            } else {
-                $oidc->addScope( $scope );
             }
+			
+            $oidc->addScope( $scope );
         }
         if ( isset( $config['proxy'] ) ) {
             $oidc->setHttpProxy( $config['proxy'] );

includes/SpecialIsekaiOIDCCallback.php

@@ -35,7 +35,7 @@ class SpecialIsekaiOIDCCallback extends LoginSignupSpecialPage {
 	}
 
 	public function getDescription() {
-		return $this->msg( 'login' )->text();
+		return $this->msg( 'login' );
 	}
 
 	public function setHeaders() {

lib/openid-connect-php/OpenIDConnectClient.php

@@ -967,7 +967,7 @@ class OpenIDConnectClient
         }
 
         // Convert token params to string format
-        $post_params = http_build_query($post_data, null, '&', $this->encType);
+        $post_params = http_build_query($post_data, '', '&', $this->encType);
 
         return json_decode($this->fetchURL($token_endpoint, $post_params, $headers), false);
     }