Deprecated FILTER_SANITIZE_STRING

Hello,
We got an error on the website, in your WP RSS Aggregator plugin (V 4.23.13):

Deprecated: Constant FILTER_SANITIZE_STRING is deprecated in /var/www/html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedTemplates/PreviewTemplateRedirectHandler.php on line 67 Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedTemplates/PreviewTemplateRedirectHandler.php:67) in /var/www/html/wp-includes/pluggable.php on line 1450 Warning: Cannot modify header information – headers already sent by (output started at /var/www/html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedTemplates/PreviewTemplateRedirectHandler.php:67) in /var/www/html/wp-includes/pluggable.php on line 1453

Although this error is Deprecated, FILTER_SANITIZE_STRING, which is used in this plugin, is no longer supported in higher versions of PHP 8.1+ and can cause an error as in this case.

We solved it with a temporary fix in this file
/var/www/html/wp-content/plugins/wp-rss-aggregator/src/Handlers/FeedTemplates/PreviewTemplateRedirectHandler.php

For the fix, we used the recommended function from WP, namely sanitize_text_field.

Line 67:

$previewId = filter_input(INPUT_GET, $this->getParam, FILTER_SANITIZE_STRING);

We replaced:
$previewId = sanitize_text_field(filter_input(INPUT_GET, $this->getParam));

and

Line 87:
$options = filter_input(INPUT_GET, ‘wpra_template_options’, FILTER_SANITIZE_STRING);

We substituted for:
$options = sanitize_text_field(filter_input(INPUT_GET, ‘wpra_template_options’));

Please update your plugin to stop this error from occurring.

Thank you.

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