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Enable the WordPress debug log without displaying errors

cautionWP-CLIalle

Caution: This command changes the system. Understand what it does before you run it.

Adjust the values, the command updates live
user@server
wp config set WP_DEBUG true --raw --path=/var/www/vhosts/example.com/httpdocs && wp config set WP_DEBUG_LOG true --raw --path=/var/www/vhosts/example.com/httpdocs && wp config set WP_DEBUG_DISPLAY false --raw --path=/var/www/vhosts/example.com/httpdocs

Sets three constants in wp-config.php: debug mode on, logging to wp-content/debug.log, no display in the browser. This captures PHP errors and warnings on live sites without exposing paths or messages to visitors. --raw makes sure true and false are written without quotes.

Note: By default, debug.log is publicly accessible and grows quickly. After troubleshooting, set WP_DEBUG back to false and delete the file.

Also searched as

  • find wordpress errors
  • enable wp_debug
  • turn on debug.log wordpress
  • find cause of white screen

Related one-liners

All in WP-CLI

Deactivate a single plugin despite a PHP fatal error

$wp plugin deactivate woocommerce --skip-plugins --skip-themes --path=/var/www/vhosts/example.com/httpdocs
cautionWP-CLI

Deactivate all plugins and save the active list

$wp plugin list --status=active --field=name --path=/var/www/vhosts/example.com/httpdocs > /var/www/vhosts/example.com/active-plugins.txt && wp plugin deactivate --all --path=/var/www/vhosts/example.com/httpdocs
cautionWP-CLI

List scheduled WP-Cron events

$wp cron event list --fields=hook,next_run_relative,recurrence --path=/var/www/vhosts/example.com/httpdocs
harmlessWP-CLI

Switch to a default WordPress theme

$wp theme activate twentytwentyfour --skip-themes --skip-plugins --path=/var/www/vhosts/example.com/httpdocs
cautionWP-CLI

Debug SSH connection problems with verbose output

$ssh -vvv -p 22 webuser@server.example.com
harmlessSSH

Back up the WordPress database as a gzip file

$wp db export - --path=/var/www/vhosts/example.com/httpdocs | gzip > /var/www/vhosts/example.com/db-backup.sql.gz
harmlessWP-CLI

Read first, then run.

The commands on myline.de act directly on servers, files and databases. A wrong path or placeholder can delete data irreversibly or make a server unreachable.

  • All commands are provided without warranty and are not tested on every system.
  • Understand what a command does before running it, and check every placeholder.
  • Make a backup first and, if possible, try it on a test system.
  • You run commands at your own risk. Liability for damages is excluded to the extent permitted by law.