Title: PHP Deprecated (PHP 8.1)
Last modified: May 5, 2023

---

# PHP Deprecated (PHP 8.1)

 *  [svenv](https://wordpress.org/support/users/svenv/)
 * (@svenv)
 * [3 years, 1 month ago](https://wordpress.org/support/topic/php-deprecated-php-8-1/)
 * [05-May-2023 14:51:14 UTC] PHP Deprecated: str_replace(): Passing null to parameter#
   2 ($replace) of type array|string is deprecated in /htdocs/wp-content/plugins/
   ajax-cart-autoupdate-for-woocommerce/ajax-cart-autoupdate-for-woocommerce.php
   on line 323

Viewing 1 replies (of 1 total)

 *  [Mindas22](https://wordpress.org/support/users/mindas22/)
 * (@mindas22)
 * [2 years, 9 months ago](https://wordpress.org/support/topic/php-deprecated-php-8-1/#post-17002557)
 * At line 323
 * before:
 *     ```wp-block-code
       $replacedKeys = str_replace('acau_', null, array_keys( $array ));
       ```
   
 * Replace with 
   after:
 *     ```wp-block-code
       $replacedKeys = str_replace('acau_', '', array_keys( $array ));
       ```
   
 * **Understand what this code is trying to do**: The `str_replace()` function is
   attempting to remove the string `'acau_'` from each key of `$array` by replacing
   it with `null`.
 * **Fix the issue**: To fix this, you should replace `null` with an empty string(`''`),
   which will achieve the same outcome.
    -  This reply was modified 2 years, 9 months ago by [Mindas22](https://wordpress.org/support/users/mindas22/).

Viewing 1 replies (of 1 total)

The topic ‘PHP Deprecated (PHP 8.1)’ is closed to new replies.

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## Tags

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

 * 1 reply
 * 2 participants
 * Last reply from: [Mindas22](https://wordpress.org/support/users/mindas22/)
 * Last activity: [2 years, 9 months ago](https://wordpress.org/support/topic/php-deprecated-php-8-1/#post-17002557)
 * Status: not resolved