Klaviyo 3.7.2
Does Klaviyo work with WordPress 6.9.1 and PHP 8.1.12? A smoke test was performed on .
Summary
Errors
| 2 | PHP notices |
| 6 | PHP deprecation warnings |
| No JavaScript exceptions | |
| All test pages loaded successfully | |
| No resource errors |
Performance
Memory usage: 57.49 KiB
The average PHP memory usage increased by this amount after activating by the plugin.
Page speed impact:
insignificant.
The plugin didn't make the site noticeably slower.
Environment
| WordPress version | 6.9.1 |
|---|---|
| PHP version | 8.1.12 |
| MySQL version | 10.6.10 |
| PHP memory limit | 512M |
Plugin Info
| Last updated | |
|---|---|
| Active installs | 100,000+ |
| WordPress.org page | https://wordpress.org/plugins/klaviyo/ |
| Badges |
|
Pages 5
Plugins ‹ Test site — WordPress
| URL | /wp-admin/plugins.php?plugin_status=all&paged=1&s |
|---|---|
| Requested URL | /wp-admin/plugins.php?action=activate&plugin=klaviyo%2Fklaviyo.php&plugin_status=all&paged=1&s&_wpnonce=e7505d2173 |
| Aspect | after-activation |
| HTTP status | 200 |
| Load time | 0.391 s |
| Memory usage | 3.79 MiB |
| JS errors | None |
| Resource errors | None |
Klaviyo
| URL | /wp-admin/admin.php?page=klaviyo_settings |
|---|---|
| Aspect | menu-item |
| HTTP status | 200 |
| Load time | 0.289 s |
| Memory usage | 3.75 MiB |
| JS errors | None |
| Resource errors | None |
Klaviyo → Help
| URL | /wp-admin/admin.php?page=klaviyo_help |
|---|---|
| Aspect | menu-item |
| HTTP status | 200 |
| Load time | 0.264 s |
| Memory usage | 3.75 MiB |
| JS errors | None |
| Resource errors | None |
Test site – Just another WordPress site
| URL | / |
|---|---|
| Aspect | front-page |
| HTTP status | 200 |
| Load time | 0.223 s |
| Memory usage | 4.15 MiB |
| JS errors | None |
| Resource errors | None |
Widgets ‹ Test site — WordPress
| URL | /wp-admin/widgets.php |
|---|---|
| Aspect | new-sidebar-widgets |
| HTTP status | 200 |
| Load time | 1.138 s |
| Memory usage | 6.21 MiB |
| JS errors | None |
| Resource errors | None |
Benchmark
| URL | Load time | Memory usage | ||||
|---|---|---|---|---|---|---|
| Inactive | Active | Change | Inactive | Active | Change | |
| /wp-admin/index.php | 0.432 s | 0.419 s | -0.013 s | 3.78 MiB | 3.83 MiB | + 51.63 KiB |
| /wp-admin/edit.php | 0.359 s | 0.301 s | -0.058 s | 3.78 MiB | 3.83 MiB | + 51.26 KiB |
| /wp-admin/post-new.php | 0.864 s | 1.083 s | +0.219 s | 6.31 MiB | 6.43 MiB | + 122.93 KiB |
| /wp-admin/upload.php | 0.664 s | 0.421 s | -0.243 s | 3.74 MiB | 3.77 MiB | + 33.85 KiB |
| /wp-admin/options-writing.php | 0.317 s | 0.308 s | -0.009 s | 3.71 MiB | 3.75 MiB | + 37.84 KiB |
| /wp-admin/media-new.php | 0.501 s | 0.308 s | -0.193 s | 3.7 MiB | 3.75 MiB | + 46.04 KiB |
| /wp-admin/edit-tags.php?taxonomy=category | 0.426 s | 0.299 s | -0.127 s | 3.72 MiB | 3.77 MiB | + 56.71 KiB |
| /wp-admin/post-new.php?post_type=page | 0.701 s | 0.896 s | +0.195 s | 6.3 MiB | 6.41 MiB | + 116.41 KiB |
| /wp-admin/options-discussion.php | 0.336 s | 0.490 s | +0.154 s | 3.71 MiB | 3.75 MiB | + 34.34 KiB |
| /wp-admin/edit-comments.php | 0.327 s | 0.340 s | +0.013 s | 3.73 MiB | 3.77 MiB | + 33.84 KiB |
| / | 0.276 s | 0.186 s | -0.090 s | 4.11 MiB | 4.15 MiB | + 47.49 KiB |
| Average | 0.473 s | 0.459 s | -0.014 s | 4.23 MiB | 4.29 MiB | + 57.49 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 »
| Lines of code | 2,073 |
|---|---|
| Total complexity | 348 |
| Median class complexity | 11.0 |
| Median method complexity | 1.5 |
| Most complex class | WPKlaviyoAdmin |
| Most complex function | wck_build_cart_data() |
| Classes | 14 |
|---|---|
| Methods | 96 |
| Functions | 39 |
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 8 lines
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:46 UTC] PHP Deprecated: htmlspecialchars(): Passing null to parameter #1 ($string) of type string is deprecated in /wp-content/plugins/klaviyo/includes/class-wck-options.php on line 79
[03-Feb-2026 20:58:48 UTC] PHP Notice: Function WP_Scripts::add was called <strong>incorrectly</strong>. The script with the handle "kl-identify-browser" was enqueued with dependencies that are not registered: klaviyojs. Please see <a href="https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/">Debugging in WordPress</a> for more information. (This message was added in version 6.9.1.) in /wp-includes/functions.php on line 6131
[03-Feb-2026 20:58:57 UTC] PHP Notice: Function WP_Scripts::add was called <strong>incorrectly</strong>. The script with the handle "kl-identify-browser" was enqueued with dependencies that are not registered: klaviyojs. Please see <a href="https://developer.wordpress.org/advanced-administration/debug/debug-wordpress/">Debugging in WordPress</a> for more information. (This message was added in version 6.9.1.) in /wp-includes/functions.php on line 6131