PHP notice: Array to string conversion in general-template.php

[balvantk]

Test Case: PHP Notice - Array to String Conversion with Multiple Coupons

Environment:

• Cart/Checkout: Classic and Block tested
• WooCommerce version: (assumed to be recent, e.g., 9.x)

Step No.	Action	Expected Result
1	Login as a registered user.	Login successful
2	Add a product to the cart.	Product is added successfully
3	Go to the Cart page.	Both coupons are auto/applied manually and reflected correctly
4	Proceed to Checkout and place the order.	Order is placed successfully
5	Check the debug.log (or other PHP error logs).	❌ PHP Notice: Array to string conversion appears if improper coupon formatting or output exists.

This error show in log file

[07-Aug-2025 05:33:32 UTC] $helper: free_gift
[07-Aug-2025 05:33:32 UTC] $current: smart_coupon
[07-Aug-2025 05:33:32 UTC] $helper: smart_coupon
[07-Aug-2025 05:33:32 UTC] $current: smart_coupon
[07-Aug-2025 05:33:32 UTC] $helper: no
[07-Aug-2025 05:33:32 UTC] $current: yes
[07-Aug-2025 05:33:32 UTC] $helper: Array
(
    [0] => 
)

[07-Aug-2025 05:33:32 UTC] $current: yes
**[07-Aug-2025 05:33:32 UTC] PHP Notice:  Array to string conversion in C:\laragon\www\StoreApps\wp-includes\general-template.php on line 5313**
[07-Aug-2025 05:33:32 UTC] $helper: no
[07-Aug-2025 05:33:32 UTC] $current: yes
[07-Aug-2025 05:33:32 UTC] $helper: no
[07-Aug-2025 05:33:32 UTC] $current: yes

[balvantk]

Patch uploaded to fix array to string conversion warning. Please review.

[balvantk]

Patch to fix PHP array to string conversion notice added. Please review.

[rollybueno]

Hey @balvantk - thanks for the patch and welcome to WP Core trac. WooCommerce is maintained separately and not part of the WordPress Core. Can you submit this issue on ​https://wordpress.org/support/plugin/woocommerce/

[SirLouen]

@balvantk, where did you find that general-template.php file?

​Those two lines do not exist in the original code

[sabernhardt]

I think fix-array-conversion.patch was supposed to add the two lines, not remove them.

However, I agree that the WooCommerce support forum should be a better place to discuss this (at least for now).