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#36627·elementor

⏳ PHP 8.4+ deprecation in Atomic_Global_Styles::get_cache_root_key() on Elementor 4.2.0

Author: RoJackalCreated Jul 23, 2026Updated Sep 22, 2026
Labelscomponent/codecompatibility/php-8mod*mod/e*mod/b*mod/v*status/evaluatingmod/svl*

Description

Elementor 4.2.0 produces a PHP deprecation notice because Atomic_Global_Styles::get_cache_root_key() declares a non-nullable string parameter with null as its default value. Implicitly nullable parameter types were deprecated in PHP 8.4. The parameter must explicitly be declared nullable.

Error

Elementor\Modules\GlobalClasses\Atomic_Global_Styles::get_cache_root_key(): Implicitly marking parameter $key as nullable is deprecated, the explicit nullable type must be used instead

Location

wp-content/plugins/elementor/modules/global-classes/atomic-global-styles.php:410

Additional evidence

The identical deprecation appears in the diagnostic information attached to issue #36591 under Elementor 4.2.0-beta2 and PHP 8.4.23. That issue concerns unrelated Atomic SVG/ACF defects, so this PHP compatibility problem requires a separate issue. Related issue containing the same diagnostic notice: https://github.com/elementor/elementor/issues/36591

Steps to reproduce

  1. Install and activate Elementor 4.2.0.
  2. Run WordPress using PHP 8.4 or PHP 8.5 with deprecation reporting enabled.
  3. Load WordPress or execute a WP-CLI command that bootstraps WordPress:
bash
wp eval 'echo "WordPress loaded.\n";'
  1. Observe the deprecation notice during shutdown.

Current declaration

php
private function get_cache_root_key( string $key = null ): string {

Expected declaration

php
private function get_cache_root_key( ?string $key = null ): string {

Expected behavior

Elementor should load on PHP 8.4 and PHP 8.5 without generating an implicit nullable parameter deprecation.

Actual behavior

The deprecation is recorded by the Elementor logger whenever the affected class is loaded.

Verified workaround

Changing the declaration to explicitly use ?string removes the deprecation:

php
private function get_cache_root_key( ?string $key = null ): string {

The modified file passes PHP syntax validation, and subsequent WP-CLI executions no longer produce the notice.

Elementor System Info

Click to reveal
txt
== Server Environment ==
	Operating System: Linux
	Software: nginx/1.31.3
	MySQL version: MariaDB Server v12.3.2-MariaDB
	PHP Version: 8.5.8
	PHP Memory Limit: 512M
	PHP Max Input Vars: 5000
	PHP Max Post Size: 128M
	GD Installed: Yes
	ZIP Installed: Yes
	Write Permissions: All right
	Elementor Library: Connected

== WordPress Environment ==
	Version: 7.0.2
	Site URL: [redacted]
	Home URL: [redacted]
	WP Multisite: No
	Max Upload Size: 128 MB
	Memory limit: 40M
	Max Memory limit: 512M
	Permalink Structure: /%postname%/
	Language: en_US
	Timezone: 0
	Debug Mode: Inactive

== Theme ==
	Name: Hello Elementor
	Version: 3.4.9
	Author: Elementor Team
	Child Theme: No

== User ==
	Role: administrator
	WP Profile lang: en-US
	User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/150.0.0.0 Safari/537.36

== Active Plugins ==
	bunny.net
		Version: 3.1.0
		Author: bunny.net

	Disable Comments RB
		Version: 1.0.27
		Author: rbPlugins

	Elementor
		Version: 4.2.0
		Author: Elementor.com

	Elementor Pro
		Version: 4.2.0
		Author: Elementor.com

	Hello Plus
		Version: 1.7.8
		Author: Elementor.com

	Imagify
		Version: 2.3.0
		Author: Imagify Image Optimizer – Optimize Images & Convert WebP & Avif

	Rank Math SEO
		Version: 1.0.274.1
		Author: Rank Math SEO

	Rank Math SEO PRO
		Version: 3.0.117
		Author: Rank Math SEO

	Redis Object Cache
		Version: 2.8.0
		Author: Till Krüss

	WP Fastest Cache
		Version: 1.4.9
		Author: Emre Vona

	WP Fastest Cache Premium
		Version: 1.7.6
		Author: Emre Vona

	Yoast Duplicate Post
		Version: 4.7
		Author: Enrico Battocchi & Team Yoast


== Elements Usage ==
	
	page : 1
		container : 5
		heading : 4
		icon-list : 2
		image : 1
		text-editor : 1
	wp-post : 1
		container : 2
		html : 1
	wp-page : 7
		container : 8
		html : 7
		posts : 1
	ehp-header : 1
		container : 1
		ehp-header : 1


== Settings ==
	
	cpt_support: post, page
	allow_tracking: yes
	unfiltered_files_upload: 1
	font_display: swap


== Features ==
	Custom Fonts: 0
	Custom Icons: 0

== Integrations ==
	


== Elementor Experiments ==
	Inline Font Icons: Active
	Additional Custom Breakpoints: Active
	Container: Active
	Optimized Markup: Active
	Panel Promotions: Active by default
	Default to New Theme Builder: Active
	Header & Footer: Active by default
	Elementor MCP WP Abilities API: Inactive by default
	Pro Free Trial Popup: Inactive by default
	Nested Elements: Active
	Pages Panel: Inactive by default
	Atomic Widgets: Active
	V4 Indications Popover: Inactive by default
	Enforce atomic widgets capabilities: Active by default
	Editor MCP for atomic widgets: Active by default
	Backward compatibility migrations: Active by default
	Global Classes: Active
	Enforce global classes capabilities: Active by default
	Variables: Active
	Variables Manager: Active by default
	Editor v4 (Opt In Page): Active by default
	Editor V4: Active
	Components: Active
	Interactions: Active by default
	Widget Creation: Active by default
	Generate website markdown: Inactive by default
	Dynamic Assets Management: Inactive by default
	Import/Export Customization: Active by default
	Site Builder: Inactive by default
	Elementor Editor Events: Inactive by default
	Atomic Form: Active by default
	Loop: Active by default
	Menu: Active
	Size Variables: Active by default
	Pro Interactions: Active by default
	In-Editor Feedback: Inactive by default


== Log ==
	
Log: showing 20 of 382026-07-15 21:43:23 [info] Elementor data updater process has been queued. [array (
  'plugin' => 'Elementor',
  'from' => '4.1.4',
  'to' => '4.1.5',
)]
2026-07-15 21:43:36 [info] elementor::elementor_updater Started 
2026-07-15 21:43:36 [info] Elementor/Upgrades - _on_each_version Start  
2026-07-15 21:43:36 [info] Elementor/Upgrades - _on_each_version Finished 
2026-07-15 21:43:36 [info] Elementor data updater process has been completed. [array (
  'plugin' => 'Elementor',
  'from' => '4.1.4',
  'to' => '4.1.5',
)]
2026-07-16 10:11:12 [info] Elementor data updater process has been queued. [array (
  'plugin' => 'Elementor Pro',
  'from' => '4.1.2',
  'to' => '4.1.3',
)]
2026-07-16 10:54:04 [info] elementor-pro::elementor_pro_updater Started 
2026-07-16 10:54:04 [info] Elementor Pro/Upgrades - _on_each_version Start  
2026-07-16 10:54:04 [info] Elementor Pro/Upgrades - _on_each_version Finished 
2026-07-16 10:54:04 [info] Elementor data updater process has been completed. [array (
  'plugin' => 'Elementor Pro',
  'from' => '4.1.2',
  'to' => '4.1.3',
)]
2026-07-20 20:09:51 [info] Elementor data updater process has been queued. [array (
  'plugin' => 'Elementor',
  'from' => '4.1.5',
  'to' => '4.2.0',
)]
2026-07-20 20:09:51 [info] Elementor data updater process has been queued. [array (
  'plugin' => 'Elementor Pro',
  'from' => '4.1.3',
  'to' => '4.2.0',
)]
2026-07-20 20:09:51 [info] elementor::elementor_updater Started 
2026-07-20 20:09:51 [info] Elementor/Upgrades - _on_each_version Start  
2026-07-20 20:09:52 [info] Elementor/Upgrades - _on_each_version Finished 
2026-07-20 20:09:52 [info] Elementor data updater process has been completed. [array (
  'plugin' => 'Elementor',
  'from' => '4.1.5',
  'to' => '4.2.0',
)]
2026-07-20 20:09:52 [info] elementor-pro::elementor_pro_updater Started 
2026-07-20 20:09:52 [info] Elementor Pro/Upgrades - _on_each_version Start  
2026-07-20 20:09:52 [info] Elementor Pro/Upgrades - _on_each_version Finished 
2026-07-20 20:09:52 [info] Elementor data updater process has been completed. [array (
  'plugin' => 'Elementor Pro',
  'from' => '4.1.3',
  'to' => '4.2.0',
)]

JS: showing 2 of 2JS: 2026-07-01 18:35:55 [error X 1][../elementor/assets/js/packages/editor-elements-panel/editor-elements-panel.min.js?ver=4.1.4:1:2342] Elementor Elements Panel wrapper element not found 
JS: 2026-07-23 13:28:55 [error X 2][../elementor/assets/js/admin.min.js?ver=4.2.0:2:42363] r.startsWith is not a function 

PHP: showing 2 of 2PHP: 2026-07-20 20:09:52 [notice X 7][../elementor/modules/global-classes/atomic-global-styles.php::410] Elementor\Modules\GlobalClasses\Atomic_Global_Styles::get_cache_root_key(): Implicitly marking parameter $key as nullable is deprecated, the explicit nullable type must be used instead [array (
  'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]
PHP: 2026-07-23 10:19:22 [error X 1][../elementor/modules/global-classes/atomic-global-styles.php::411] syntax error, unexpected token "return", expecting ";" or "{" [array (
  'trace' => '
#0: Elementor\Core\Logger\Manager -> shutdown()
',
)]



== Elementor - Compatibility Tag ==
	
	Elementor Pro: Compatible

== Elementor Pro - Compatibility Tag ==

Agreement

  • I confirm I have read and followed all the guidelines and instructions outlined in the Elementor Bug Report form.
  • I agree that my issue may be closed without further action if it doesn't meet all the requirements outlined in the Elementor Bug Report form.

Source: elementor/elementor

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