diff --git a/includes/TemplateParser.php b/includes/TemplateParser.php
index 75494b1ed8e..11a8e85656a 100644
--- a/includes/TemplateParser.php
+++ b/includes/TemplateParser.php
@@ -220,6 +220,6 @@ class TemplateParser {
 	 */
 	public function processTemplate( $templateName, $args, array $scopes = [] ) {
 		$template = $this->getTemplate( $templateName );
-		return call_user_func( $template, $args, $scopes );
+		return $template( $args, $scopes );
 	}
 }
diff --git a/includes/WebResponse.php b/includes/WebResponse.php
index 9396a41a766..45cc7df7a60 100644
--- a/includes/WebResponse.php
+++ b/includes/WebResponse.php
@@ -205,7 +205,7 @@ class WebResponse {
 				wfDebugLog( 'cookie', 'already set ' . $func . ': "' . implode( '", "', $data ) . '"' );
 			} else {
 				wfDebugLog( 'cookie', $func . ': "' . implode( '", "', $data ) . '"' );
-				if ( call_user_func_array( $func, array_values( $data ) ) ) {
+				if ( $func( ...array_values( $data ) ) ) {
 					self::$setCookies[$key] = $deleting ? null : [ $func, $data ];
 				}
 			}
diff --git a/includes/filerepo/file/File.php b/includes/filerepo/file/File.php
index 923484add8c..c3b519944c1 100644
--- a/includes/filerepo/file/File.php
+++ b/includes/filerepo/file/File.php
@@ -207,7 +207,7 @@ abstract class File implements IDBAccessObject {
 		if ( !is_callable( $function ) ) {
 			return null;
 		} else {
-			$this->$name = call_user_func( $function );
+			$this->$name = $function();
 
 			return $this->$name;
 		}
diff --git a/includes/htmlform/fields/HTMLInfoField.php b/includes/htmlform/fields/HTMLInfoField.php
index c0dbf500d2e..b4aab4a020c 100644
--- a/includes/htmlform/fields/HTMLInfoField.php
+++ b/includes/htmlform/fields/HTMLInfoField.php
@@ -22,7 +22,7 @@ class HTMLInfoField extends HTMLFormField {
 	public function getDefault() {
 		$default = parent::getDefault();
 		if ( $default instanceof Closure ) {
-			$default = call_user_func( $default, $this->mParams );
+			$default = $default( $this->mParams );
 		}
 		return $default;
 	}
diff --git a/includes/registration/ExtensionRegistry.php b/includes/registration/ExtensionRegistry.php
index 88d9fd3f99f..e3df4999875 100644
--- a/includes/registration/ExtensionRegistry.php
+++ b/includes/registration/ExtensionRegistry.php
@@ -374,7 +374,7 @@ class ExtensionRegistry {
 				}
 				throw new UnexpectedValueException( "callback '$cb' is not callable" );
 			}
-			call_user_func( $cb, $info['credits'][$name] );
+			$cb( $info['credits'][$name] );
 		}
 	}