Title: Deprecated PHP
Last modified: January 8, 2026

---

# Deprecated PHP

 *  Resolved [Malae](https://wordpress.org/support/users/malae/)
 * (@malae)
 * [5 months ago](https://wordpress.org/support/topic/deprecated-php-20/)
 * Hello,
 * I have upgraded to PHP 8.3 and have the following deprecated PHP warning:
 * PHP Deprecated: shiftnav_html_atts(): Implicitly marking parameter $callback 
   as nullable is deprecated, the explicit nullable type must be used instead in/
   wp-content/plugins/shiftnav-responsive-mobile-menu/includes/functions.php on 
   line 714
 * I would appreciate your fixing this.

Viewing 1 replies (of 1 total)

 *  Plugin Author [sevenspark](https://wordpress.org/support/users/sevenspark/)
 * (@sevenspark)
 * [4 months, 3 weeks ago](https://wordpress.org/support/topic/deprecated-php-20/#post-18783481)
 * Hi [@malae](https://wordpress.org/support/users/malae/) ,
 * Thanks for letting me know. You can fix this by making a simple change in that
   functions.php file on line 714. Just change the function signature from:
 *     ```wp-block-code
       function shiftnav_html_atts(array $attr, callable $callback = null)
       ```
   
 * to:
 *     ```wp-block-code
       function shiftnav_html_atts(array $attr, ?callable $callback = null)
       ```
   
 * (add a `?` before `callable`)
 * and that should resolve the deprecation notice. I’ll also include this with the
   next update.
 * Thanks!
 * Chris

Viewing 1 replies (of 1 total)

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## Tags

 * [deprecated.php](https://wordpress.org/support/topic-tag/deprecated-php/)

 * 1 reply
 * 2 participants
 * Last reply from: [sevenspark](https://wordpress.org/support/users/sevenspark/)
 * Last activity: [4 months, 3 weeks ago](https://wordpress.org/support/topic/deprecated-php-20/#post-18783481)
 * Status: resolved