1. Home
2. Klaviyo
3. 3.7.2 (latest)

Klaviyo 3.7.2

Does Klaviyo work with WordPress 6.9 and PHP 8.1.12? A smoke test was performed on 2025-12-02 23:34:06 UTC.

Summary

Pages 5

Plugins ‹ Test site — WordPress

Klaviyo

Klaviyo → Help

Test site – Just another WordPress site

Widgets ‹ Test site — WordPress

Benchmark

URL	Load time			Memory usage
	Inactive	Active	Change	Inactive	Active	Change
/wp-admin/index.php	0.446 s	0.384 s	-0.062 s	3.78 MiB	3.83 MiB	+ 51.64 KiB
/wp-admin/edit.php	0.368 s	0.447 s	+0.079 s	3.78 MiB	3.83 MiB	+ 51.27 KiB
/wp-admin/post-new.php	0.871 s	0.936 s	+0.065 s	6.31 MiB	6.43 MiB	+ 122.93 KiB
/wp-admin/upload.php	0.455 s	0.552 s	+0.097 s	3.74 MiB	3.77 MiB	+ 33.85 KiB
/wp-admin/options-writing.php	0.350 s	0.317 s	-0.033 s	3.71 MiB	3.75 MiB	+ 37.84 KiB
/wp-admin/media-new.php	0.562 s	0.346 s	-0.216 s	3.7 MiB	3.75 MiB	+ 46.04 KiB
/wp-admin/edit-tags.php?taxonomy=category	0.340 s	0.471 s	+0.131 s	3.72 MiB	3.77 MiB	+ 56.71 KiB
/wp-admin/post-new.php?post_type=page	0.711 s	0.720 s	+0.009 s	6.3 MiB	6.41 MiB	+ 116.41 KiB
/wp-admin/options-discussion.php	0.340 s	0.406 s	+0.066 s	3.71 MiB	3.75 MiB	+ 34.34 KiB
/wp-admin/edit-comments.php	0.353 s	0.329 s	-0.024 s	3.73 MiB	3.77 MiB	+ 33.84 KiB
/	0.287 s	0.190 s	-0.097 s	4.12 MiB	4.16 MiB	+ 41.8 KiB
Average	0.462 s	0.463 s	+0.001 s	4.24 MiB	4.29 MiB	+ 56.97 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	83.1%	2,158	1,355	24
	JavaScript	9.4%	245	82	6
	CSS	5.8%	150	19	1
	JSON	1.3%	34	0	1
	SVG	0.4%	11	0	4
Total			2,598	1,456	36

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 4

• klaviyo_activation_time
• widget_klaviyo_emailsignup_widget
• widget_klaviyo_embedemailsignup_widget
• woocommerce_klaviyo_version

Sidebar Widgets 2

ID	Name
klaviyo_emailsignup_widget	Klaviyo: Legacy Email Sign Up
klaviyo_embedemailsignup_widget	Klaviyo: Email Sign Up

PHP Error Log 10 lines

[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:26 UTC] PHP Deprecated:  htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[02-Dec-2025 23:34:28 UTC] PHP Deprecated:  Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[02-Dec-2025 23:34:28 UTC] PHP Deprecated:  Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[02-Dec-2025 23:34:37 UTC] PHP Deprecated:  Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131
[02-Dec-2025 23:34:37 UTC] PHP Deprecated:  Function WP_Dependencies-&gt;add_data() was called with an argument that is <strong>deprecated</strong> since version 6.9.0! IE conditional comments are ignored by all supported browsers. in /wp-includes/functions.php on line 6131

---