1. Home
2. 404 Solution
3. 4.0.1

404 Solution 4.0.1

Does 404 Solution work with WordPress 6.9.4 and PHP 8.1.12? A smoke test was performed on 2026-03-25 19:54:20 UTC.

Summary

Pages 5

Plugins ‹ Test site — WordPress

Settings → 404 Solution

Test site – Just another WordPress site

Add Post ‹ Test site — WordPress

Add Page ‹ Test site — WordPress

Benchmark

URL	Load time			Memory usage
	Inactive	Active	Change	Inactive	Active	Change
/wp-admin/index.php	0.434 s	0.372 s	-0.062 s	3.78 MiB	4.21 MiB	+ 436.38 KiB
/wp-admin/edit.php	0.370 s	0.336 s	-0.034 s	3.79 MiB	4.26 MiB	+ 486.41 KiB
/wp-admin/post-new.php	0.880 s	1.023 s	+0.143 s	6.31 MiB	6.9 MiB	+ 600.4 KiB
/wp-admin/upload.php	0.556 s	0.465 s	-0.091 s	3.74 MiB	4.15 MiB	+ 418.87 KiB
/wp-admin/options-writing.php	0.344 s	0.314 s	-0.030 s	3.72 MiB	4.13 MiB	+ 422.86 KiB
/wp-admin/media-new.php	0.532 s	0.328 s	-0.204 s	3.71 MiB	4.13 MiB	+ 431.05 KiB
/wp-admin/edit-tags.php?taxonomy=category	0.338 s	0.306 s	-0.032 s	3.72 MiB	4.15 MiB	+ 441.73 KiB
/wp-admin/post-new.php?post_type=page	0.713 s	0.646 s	-0.067 s	6.3 MiB	6.88 MiB	+ 593.09 KiB
/wp-admin/options-discussion.php	0.342 s	0.419 s	+0.077 s	3.72 MiB	4.13 MiB	+ 419.36 KiB
/wp-admin/edit-comments.php	0.340 s	0.349 s	+0.009 s	3.74 MiB	4.15 MiB	+ 418.86 KiB
/	0.286 s	0.207 s	-0.079 s	4.12 MiB	4.17 MiB	+ 50.39 KiB
Average	0.467 s	0.433 s	-0.034 s	4.24 MiB	4.66 MiB	+ 429.04 KiB

Code Statistics

Note: Third-party libraries and minified JS/CSS files are excluded from these statistics where possible, so the numbers you see here may be lower than those reported by other tools.

Language		%	Lines of code	Comment lines	Files
	PO File	42.6%	27,909	2,590	13
	PHP	41.7%	27,324	9,130	89
	CSS	6.1%	4,026	388	4
	JavaScript	4.7%	3,050	634	19
	HTML	2.3%	1,527	38	44
	Markdown	1.6%	1,042	0	2
	SQL	0.9%	613	131	40
	JSON	0.1%	45	0	1
Total			65,536	12,911	212

PHP Code Analysis | More results »

Additions

Things that the plugin adds to the site. This section is not intended to be comprehensive. The test tool only looks for a few specific types of added content.

Database Tables 9

• wp_abj404_engine_profiles
• wp_abj404_logsv2
• wp_abj404_lookup
• wp_abj404_ngram_cache
• wp_abj404_permalink_cache
• wp_abj404_redirect_conditions
• wp_abj404_redirects
• wp_abj404_spelling_cache
• wp_abj404_view_cache

Options wp_options 3

• abj404_installed_time
• abj404_ngram_rebuild_offset
• abj404_settings

Meta Boxes

{
    "post": {
        "abj404_redirect_meta_box": {
            "title": "404 Solution",
            "context": "side"
        }
    },
    "page": {
        "abj404_redirect_meta_box": {
            "title": "404 Solution",
            "context": "side"
        }
    },
    "attachment": {
        "abj404_redirect_meta_box": {
            "title": "404 Solution",
            "context": "side"
        }
    }
}

PHP Error Log 15 lines

[25-Mar-2026 19:54:39 UTC] WordPress database error Table 'wordpress.wp_abj404_lookup' doesn't exist for query 
/* ------------------ /wp-content/plugins/404-solution/includes/sql/correctLookupTableIssue.sql BEGIN ----- */ 

delete from wp_abj404_lookup
where lkup_value in (
    select lkup_value from (
	    SELECT DISTINCT lkup_value
	    FROM wp_abj404_lookup
	    group by lkup_value
	    having count(lkup_value) > 1
    ) a
)

/* ------------------ /wp-content/plugins/404-solution/includes/sql/correctLookupTableIssue.sql END ----- */ 
 made by activate_plugin, plugin_sandbox_scrape, include_once('/plugins/404-solution/404-solution.php'), require_once('/plugins/404-solution/includes/Loader.php'), ABJ_404_Solution_SpellChecker::init, ABJ_404_Solution_SpellChecker::getInstance, ABJ_404_Solution_ServiceContainer->get, {closure}, ABJ_404_Solution_SpellChecker->__construct, ABJ_404_Solution_PluginLogic->getOptions, ABJ_404_Solution_PluginLogic->updateToNewVersion, ABJ_404_Solution_PluginLogic->updateToNewVersionAction, ABJ_404_Solution_DatabaseUpgradesEtc->createDatabaseTables, ABJ_404_Solution_DatabaseUpgradesEtc->reallyCreateDatabaseTables, ABJ_404_Solution_DatabaseUpgradesEtc->correctIssuesBefore, ABJ_404_Solution_DataAccess->correctDuplicateLookupValues, ABJ_404_Solution_DataAccess->queryAndGetResults

---