Consider replacing FILTER_SANITIZE_STRING, since it is deprecated as of PHP 8.1.0

[anastas10s-afk]

Describe the bug
Came across a report on the forums, where the site's logs report the following:
PHP Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /wp-content/plugins/woocommerce-gateway-stripe/includes/class-wc-stripe-customer.php on line 189

As it appears, it would be beneficial to use htmlspecialchars() instead, as FILTER_SANITIZE_STRING (int) ID of “string” filter is deprecated as of PHP 8.1.0.

Additional context
Per the search results, linked here, it appears in the files:

• includes/class-wc-stripe-customer.php
• includes/payment-methods/class-wc-stripe-payment-request.php

Moreover htmlspecialchars() is compatible with current and future PHP versions, as I understand.

For context:

• https://wordpress.org/support/topic/filter_sanitize_string-is-deprecated-3/
• 8014265-zen

#hc

[anastas10s-afk]

cc @a-danae 🙂

[a-danae]

Ack. Thanks for the heads up @anastas10s-afk ! 🙂

[mattallan]

Oh sorry @a-danae ! I just found this issue after opening a PR and noticed you assigned yourself to it a month ago. It was only a small change but I hope you weren't also in the middle of fixing it

PR here: #3144

[a-danae]

No way, thanks for fixing this @mattallan ! 🙌