Title: PHP Deprecated error
Last modified: July 16, 2025

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# PHP Deprecated error

 *  Resolved [Qilin](https://wordpress.org/support/users/qilin2000/)
 * (@qilin2000)
 * [10 months, 2 weeks ago](https://wordpress.org/support/topic/php-deprecated-error-25/)
 * Hello there,
 * The plugin causes PHP Deprecated error, here is the error message:
 * PHP Deprecated Constant FILTER_SANITIZE_STRING is deprecated in mywebsite\wp-
   content\plugins\comment-reply-email-notification\classes\CommentReplyEmailNotification.
   php on line 352
 * My environment: wordpress 6.8.2 on PHP 8.1.32
 * Please look into it, thanks!

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Arno Welzel](https://wordpress.org/support/users/awelzel/)
 * (@awelzel)
 * [10 months, 2 weeks ago](https://wordpress.org/support/topic/php-deprecated-error-25/#post-18558676)
 * This is not an error but a warning, that something has to be changed to avoid
   errors in the future, because a feature was deprecated and should not be used
   any longer. I will update this as soon as possible.
 *  Plugin Author [Arno Welzel](https://wordpress.org/support/users/awelzel/)
 * (@awelzel)
 * [10 months, 2 weeks ago](https://wordpress.org/support/topic/php-deprecated-error-25/#post-18558700)
 * Version 1.36.0 will fix this.
 *  Thread Starter [Qilin](https://wordpress.org/support/users/qilin2000/)
 * (@qilin2000)
 * [10 months, 2 weeks ago](https://wordpress.org/support/topic/php-deprecated-error-25/#post-18560036)
 * Hi [@awelzel](https://wordpress.org/support/users/awelzel/),
 * I have upgraded to the latest version of the plugin (1.37.0), the warning is 
   gone, all work perfectly, thank you very much!

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘PHP Deprecated error’ is closed to new replies.

 * ![](https://ps.w.org/comment-reply-email-notification/assets/icon-256x256.jpg?
   rev=2953064)
 * [Comment Reply Email Notification](https://wordpress.org/plugins/comment-reply-email-notification/)
 * [Support Threads](https://wordpress.org/support/plugin/comment-reply-email-notification/)
 * [Active Topics](https://wordpress.org/support/plugin/comment-reply-email-notification/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/comment-reply-email-notification/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/comment-reply-email-notification/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [Qilin](https://wordpress.org/support/users/qilin2000/)
 * Last activity: [10 months, 2 weeks ago](https://wordpress.org/support/topic/php-deprecated-error-25/#post-18560036)
 * Status: resolved