Title: Constant array_flip() Error in Error Logs
Last modified: June 18, 2024

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# Constant array_flip() Error in Error Logs

 *  Resolved [infinitejake](https://wordpress.org/support/users/infinitejake/)
 * (@infinitejake)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/)
 * While looking through the error logs today due to an issue with our checkout 
   process not working or working but being incredibly slow I noticed that we are
   getting this error reported twice a second every second:
   PHP Warning:  array_flip():
   Can only flip STRING and INTEGER values! in /home/infin240/public_html/wp-content/
   plugins/woocommerce/includes/rest-api/Controllers/Version3/class-wc-rest-posts-
   controller.php on line 512
 * It seems like this might have to do with the REST API being discontinued. I activated
   the new REST API plugin and the error continues twice every second. Any assistance
   in figuring this out would be greatly appreciate. I am relatively new to WooCommerce
   and I see a lot of changes happening as version 9 is getting closer. Would love
   to get this figured out before even more changes!

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Support [omarfpg a11n](https://wordpress.org/support/users/omarfpg/)
 * (@omarfpg)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17834100)
 * Hi [@infinitejake](https://wordpress.org/support/users/infinitejake/),
 * This is unusual and it may mean something else is interferring with your set 
   up. I see you had a couple of support requests open about this: 8229657, and 
   8274336. As mentioned in one over tickets, this most likely is related to a plugin
   conflict. I see there are 51 active plugins on your site.
 * Can you please run a conflict test to determine if one of those plugins is interfering?
   
   To test, you’ll first want to change the theme on your site to Storefront, then
   check to see if the issue is still present. If that resolves the issue, you’ll
   want to get in touch with your theme’s developer and see if they have an update
   or fix for you.If changing the theme doesn’t help, you’ll want to deactivate 
   all plugins except for WooCommerce and take a look. If that fixes the problem,
   re-enable the other plugins one by one (gradually), checking after each to see
   where the issue is coming from.
 * **Some important considerations**: 
   — Be sure you have a good backup in place
   of your full site and database. You can ask your host for backup functionality,
   or you can consider using a service like [**Jetpack**](https://jetpack.com/).
   If something goes wrong, you will be able to restore it.— Also, you can consider
   using a plugin like [**Health Check & Troubleshooting**](https://wordpress.org/plugins/health-check/).
   This is a plugin developed by the WordPress community, and it is helpful to disable
   plugins without affecting your current site visitors.— It is also important to
   consider staging functionality in case you would not like to touch your production
   site (you can ask your host if they offer this service), or you can use [**WP Staging**](https://wordpress.org/plugins/wp-staging/)
   to spin up a new test site quickly.You can find more about this in this [**guide**](https://woo.com/document/woocommerce-self-service-guide/).
   Please let us know about your findings.
 * PS: We just released WooCommerce 9.0 earlier today!
 * Cheers!
   -OP
 *  Thread Starter [infinitejake](https://wordpress.org/support/users/infinitejake/)
 * (@infinitejake)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17834202)
 * The issue we are running into is that, yes we have a ton of plugins on the site
   which I am working to remove unnecessary ones, but we have an active site that
   has users on it at most times so switching to a theme that doesn’t work for us
   and disabling all of the plugins would be bad. The issue is not happening on 
   our staging site either so that doesn’t help. 
   I looked into the Health Check
   plugin but there are a ton of reviews saying that it completely ruins websites
   to the point that they need to be restored from a backup. A plugin like health
   check would be amazing but I’m not finding any other good ones either.
 *  Plugin Support [Shameem – a11n](https://wordpress.org/support/users/shameemreza/)
 * (@shameemreza)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17835073)
 * Hi [@infinitejake](https://wordpress.org/support/users/infinitejake/)
 * When dealing with a live site, it’s indeed challenging to troubleshoot without
   causing potential disruptions. However, it’s important to isolate the issue to
   be able to resolve it effectively.
 * Given your concerns about the Health Check plugin, another approach could be 
   to create a clone of your site and troubleshoot on the cloned version. This way,
   your live site remains unaffected. More info: [https://woocommerce.com/posts/what-is-staging-site-wordpress-how-to-set-one-up/](https://woocommerce.com/posts/what-is-staging-site-wordpress-how-to-set-one-up/)
 * Once you have a cloned site, you can safely run the conflict test, as suggested
   earlier. If the issue doesn’t appear on the cloned site, it could be related 
   to server-specific issues, and you may need to get in touch with your hosting
   provider.
 * As for the REST API error, it’s unlikely related to the API being discontinued.
   Instead, it’s more likely due to how a specific plugin or theme is interacting
   with the API. Hence, the conflict test should help identify the source of this
   issue.
 * Looking forward to hearing from you soon.
 *  Thread Starter [infinitejake](https://wordpress.org/support/users/infinitejake/)
 * (@infinitejake)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17847461)
 * Hello [@shameemreza](https://wordpress.org/support/users/shameemreza/),
   Sorry
   for the delay but I cloned our entire site and have been using it for the past
   4-5 days and the error is not showing up at all so I’m still unsure how to tackle
   this without disabling the live plugins on production. I turned the theme off
   on our cloned site too and none of the ecommerce stuff works so A: I’m worried
   the error will stop anyway since no one can do anything on the websiteB: I can’t
   test any of this on the cloned site since the error isn’t happeningC: We can’t
   even put up a screen saying we are working on things since we apparently need
   people using the site to trigger the error.Any other ideas on how to figure this
   out?
 *  Plugin Support [Shameem – a11n](https://wordpress.org/support/users/shameemreza/)
 * (@shameemreza)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17847838)
 * Hi [@infinitejake](https://wordpress.org/support/users/infinitejake/)
 * It’s great to hear that you’ve cloned your site for testing, but it’s indeed 
   puzzling that the error isn’t showing up on the cloned site. This suggests that
   the issue could be related to your hosting environment or a specific setting 
   on your live site.
 * Here are a few additional steps you could take:
    1. Check for differences between your live and cloned site’s server environments,
       including PHP versions and server configurations.
    2. Keep monitoring the error logs on your live site. If the error is still occurring,
       it might give us a clue about what’s causing it.
    3. If possible, consider performing the conflict test during off-peak hours. While
       not ideal, it could help identify the problematic plugin or theme without affecting
       too many users.
    4. Since the issue isn’t replicating on the cloned site, it might be worthwhile
       to get in touch with your hosting provider. They might be able to provide insights
       or detect issues on their end.
 * Remember, it’s crucial to have a recent backup of your site before making any
   changes.
 * Additionally, are you still experiencing this error with the latest version of
   WooCommerce? Have you updated all your plugins and theme? Can you head over to
   WooCommerce → Status → Tools, and do the following:
    - WooCommerce transients – Clear
    - Expired transients – Clear
    - Clear template cache – Clear
    - Capabilities – Reset Capabilities
    - Clear customer sessions -Clear
 * Please let us know how these steps work out, or if you have any other questions.
   We’re here to help!
 *  Plugin Support [omarfpg a11n](https://wordpress.org/support/users/omarfpg/)
 * (@omarfpg)
 * [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17866676)
 * Hi there 👋 ,
 * We haven’t heard from you in a while; this is to check if you’ve been able to
   proceed with the troubleshooting steps provided before and if you still need 
   help.
 * Thanks!
   -OP

Viewing 6 replies - 1 through 6 (of 6 total)

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## Tags

 * [errors](https://wordpress.org/support/topic-tag/errors/)

 * 6 replies
 * 3 participants
 * Last reply from: [omarfpg a11n](https://wordpress.org/support/users/omarfpg/)
 * Last activity: [1 year, 11 months ago](https://wordpress.org/support/topic/constant-array_flip-error-in-error-logs/#post-17866676)
 * Status: resolved