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Offline Pre-Cache 1.0.1

Does Offline Pre-Cache work with WordPress 6.9.4 and PHP 8.1.12? A smoke test was performed on 2026-04-06 18:38:04 UTC.

Summary

Pages 3

Offline Pre-cache ‹ Test site — WordPress

Settings → Offline Pre-cache

Test site – Just another WordPress site

Benchmark

URL	Load time			Memory usage
	Inactive	Active	Change	Inactive	Active	Change
/wp-admin/index.php	0.499 s	0.353 s	-0.146 s	3.78 MiB	3.79 MiB	+ 11.55 KiB
/wp-admin/edit.php	0.385 s	0.330 s	-0.055 s	3.78 MiB	3.79 MiB	+ 11.55 KiB
/wp-admin/post-new.php	0.802 s	0.941 s	+0.139 s	6.31 MiB	6.32 MiB	+ 11.55 KiB
/wp-admin/upload.php	0.502 s	0.566 s	+0.064 s	3.74 MiB	3.73 MiB	- 5.8 KiB
/wp-admin/options-writing.php	0.336 s	0.309 s	-0.027 s	3.71 MiB	3.71 MiB	- 1.81 KiB
/wp-admin/media-new.php	0.520 s	0.362 s	-0.158 s	3.7 MiB	3.71 MiB	+ 6.38 KiB
/wp-admin/edit-tags.php?taxonomy=category	0.350 s	0.296 s	-0.054 s	3.72 MiB	3.73 MiB	+ 17.05 KiB
/wp-admin/post-new.php?post_type=page	0.715 s	0.864 s	+0.149 s	6.3 MiB	6.31 MiB	+ 11.55 KiB
/wp-admin/options-discussion.php	0.354 s	0.433 s	+0.079 s	3.71 MiB	3.71 MiB	- 5.31 KiB
/wp-admin/edit-comments.php	0.342 s	0.375 s	+0.033 s	3.73 MiB	3.73 MiB	- 5.81 KiB
Average	0.480 s	0.483 s	+0.002 s	4.25 MiB	4.25 MiB	+ 5.09 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
	PHP	49.1%	436	46	6
	CSS	36.1%	321	2	1
	JavaScript	14.8%	131	26	3
Total			888	74	10

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.

Options wp_options 1

• offline_precache_page_id

PHP Error Log 30 lines

[06-Apr-2026 18:38:26 UTC] PHP Fatal error:  Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method OfflinePrecache::register_service_worker() cannot be called statically in /wp-includes/class-wp-hook.php:341
Stack trace:
#0 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#1 /wp-includes/plugin.php(522): WP_Hook->do_action()
#2 /wp-includes/general-template.php(3197): do_action()
#3 /wp-content/themes/twentyseventeen/header.php(22): wp_head()
#4 /wp-includes/template.php(814): require_once('...')
#5 /wp-includes/template.php(749): load_template()
#6 /wp-includes/general-template.php(48): locate_template()
#7 /wp-content/themes/twentyseventeen/index.php(18): get_header()
#8 /wp-includes/template-loader.php(132): include('...')
#9 /wp-blog-header.php(19): require_once('...')
#10 /index.php(17): require('...')
#11 {main}
  thrown in /wp-includes/class-wp-hook.php on line 341
[06-Apr-2026 18:38:35 UTC] PHP Fatal error:  Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method OfflinePrecache::register_service_worker() cannot be called statically in /wp-includes/class-wp-hook.php:341
Stack trace:
#0 /wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters()
#1 /wp-includes/plugin.php(522): WP_Hook->do_action()
#2 /wp-includes/general-template.php(3197): do_action()
#3 /wp-content/themes/twentyseventeen/header.php(22): wp_head()
#4 /wp-includes/template.php(814): require_once('...')
#5 /wp-includes/template.php(749): load_template()
#6 /wp-includes/general-template.php(48): locate_template()
#7 /wp-content/themes/twentyseventeen/index.php(18): get_header()
#8 /wp-includes/template-loader.php(132): include('...')
#9 /wp-blog-header.php(19): require_once('...')
#10 /index.php(17): require('...')
#11 {main}
  thrown in /wp-includes/class-wp-hook.php on line 341

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