Title: Deprecated error PHP 8.1
Last modified: October 29, 2023

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# Deprecated error PHP 8.1

 *  Resolved [Betty](https://wordpress.org/support/users/bettyst/)
 * (@bettyst)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/deprecated-error-php-8-1/)
 * I got a big error on my “blog” site: 
   **Deprecated**: preg_replace(): Passing
   null to parameter #3 ($subject) of type array|string is deprecated in **/kunden/
   310577_5760/webseiten/wordpress/wp-content/themes/mesmerize/inc/functions.php**
   on line **253**I recently switched to PHP 8.1
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fdeprecated-error-php-8-1%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  [cristianbarbu](https://wordpress.org/support/users/cristianbarbu/)
 * (@cristianbarbu)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/deprecated-error-php-8-1/#post-17160261)
 * Hello,
 * Warnings and notices are not affecting the behavior of the site and they should
   not be displayed in the browser on live servers.
 * Please add the following line to your wp-config.php file so the warnings are 
   not displayed on the site.
 * ini_set(“display_errors”, 0);
   ​​Please also see:
 * [https://www.wpbeginner.com/wp-tutorials/how-to-turn-off-php-errors-in-wordpress](https://www.wpbeginner.com/wp-tutorials/how-to-turn-off-php-errors-in-wordpress)
 *  Thread Starter [Betty](https://wordpress.org/support/users/bettyst/)
 * (@bettyst)
 * [2 years, 7 months ago](https://wordpress.org/support/topic/deprecated-error-php-8-1/#post-17161461)
 * Thanks, you are totally right – i disabled the DEBUG

Viewing 2 replies - 1 through 2 (of 2 total)

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

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 * 2 replies
 * 2 participants
 * Last reply from: [Betty](https://wordpress.org/support/users/bettyst/)
 * Last activity: [2 years, 7 months ago](https://wordpress.org/support/topic/deprecated-error-php-8-1/#post-17161461)
 * Status: resolved