Title: Constant WP_DEBUG_DISPLAY already defined
Last modified: March 5, 2024

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# Constant WP_DEBUG_DISPLAY already defined

 *  Resolved [andreios](https://wordpress.org/support/users/andreios/)
 * (@andreios)
 * [2 years, 3 months ago](https://wordpress.org/support/topic/constant-wp_debug_display-already-defined/)
 * `PHP message: PHP Warning: Constant WP_DEBUG_DISPLAY already defined in /var/
   www/vhosts/bla/httpdocs/wp-config.php on line 81" while reading response header
   from upstream`
 * I have this error in the logs although I no longer have WP_DEBUG_DISPLAY in wp-
   config.php. Can someone explain this?

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

 *  Moderator [Steven Stern (sterndata)](https://wordpress.org/support/users/sterndata/)
 * (@sterndata)
 * Volunteer Forum Moderator
 * [2 years, 3 months ago](https://wordpress.org/support/topic/constant-wp_debug_display-already-defined/#post-17476202)
 * Might you have more than one wp-config.php file? (One in the “normal” home directory,
   one one level above.) Or, what’s in lines 75-85 of wp-config.php?
 *  Thread Starter [andreios](https://wordpress.org/support/users/andreios/)
 * (@andreios)
 * [2 years, 2 months ago](https://wordpress.org/support/topic/constant-wp_debug_display-already-defined/#post-17534381)
 * There was nothing special on these lines and there was no other wp-config. It
   was a issue with PHP FPM 8.2.17 provided by Plesk. I downgraded to 8.1. Everything
   is fine now.
    -  This reply was modified 2 years, 2 months ago by [andreios](https://wordpress.org/support/users/andreios/).

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

The topic ‘Constant WP_DEBUG_DISPLAY already defined’ is closed to new replies.

 * In: [Everything else WordPress](https://wordpress.org/support/forum/miscellaneous/)
 * 2 replies
 * 2 participants
 * Last reply from: [andreios](https://wordpress.org/support/users/andreios/)
 * Last activity: [2 years, 2 months ago](https://wordpress.org/support/topic/constant-wp_debug_display-already-defined/#post-17534381)
 * Status: resolved

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