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WordPress/wp-includes
Sergey Biryukov 4f8f42747f Code Modernization: Correct the check for parent argument in wp_insert_term() and wp_update_term().
PHP 8 changes the way string to number comparisons are performed: https://wiki.php.net/rfc/string_to_number_comparison

In particular, checking if a non-empty, non-numeric string is greater than zero in PHP 8 evaluates to `true`, not `false`.

For `wp_insert_term()`, this resulted in a "Parent term does not exist" error for a non-numeric string, instead of discarding the value.

By explicitly casting the value to `int`, we make sure to compare both values as numbers, rather than a string and a number.

Follow-up to [29196], [29830], [29867].

See #50913.
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