PHP 8 Fatal Error: array_diff() Argument #1 must be array

Hi,

We encountered a fatal error when saving settings in the plugin under PHP 8.x.

Error message:

Fatal error: Uncaught TypeError: array_diff(): Argument #1 ($array) must be of type array, false given in /wp-content/plugins/searchpro/inc/helper-functions.php on line 1592

The issue occurs inside the function:

bwp_is_option_updated()

Specifically this line:

return !empty(array_diff($option_val, $urls_array));

In some cases get_option($option_name) returns false (likely when the option does not yet exist), which causes array_diff() to throw a TypeError in PHP 8+.

As a temporary fix, we changed the line to:

return !empty(array_diff(is_array($option_val) ? $option_val : [], $urls_array));

This prevents the fatal error and ensures compatibility with PHP 8.

It may be worth updating the plugin to validate that $option_val is always an array before calling array_diff() to avoid breaking admin pages under newer PHP versions.

Environment:

• WordPress: Latest
• PHP: 8.x
• Plugin version: 3.1.17

Hope this helps.