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How to Increase WordPress PHP Memory

Reasonably add the memory limit available for WordPress when, a memory error the requires.

TopicWordPress →
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WordPress Intermediate. 7 min

Reasonably add the memory limit available for WordPress when, a memory error the requires.

Avant de commencer : adaptez toujours les commandes et manipulations à votre environnement. Sur un système de production, prévoyez une backup ou un retour arrière lorsque l’action peut modifier la configuration.

Étapes à suivre

  1. 1

    Check the current limit

    See Tools > Site Health > Information > Serving.

  2. 2

    Control the boundaries of the hosting

    The WordPress value cannot exceed the limits actually allowed by PHP/host.

  3. 3

    Edit wp-config.php if appropriate

    Add a WP_MEM constant before the end of edition line.

  4. 4

    Retester site

    Check if the error disappears.

  5. 5

    Searching for cause

    Excessive consumption may come from a plugin, a theme or an abnormal request.

Commands utiles

(g) ‘WP_MEM', ‘256M';

À retenir

  • Overtime incrementing memory does not fix a faulty leak or plugin.
  • Contain a copy of wp-config.php before modification.
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Technical deep dive

WordPress: deepen diagnosis without hiding the root cause

Technical checkpoints

  • WP_DEBUG_LOG usually writes to wp-content/debug.log only when WP_DEBUG is enabled and the PHP process can write the file.
  • Renaming a plugin directory prevents it from loading without changing the database, which is useful when wp-admin is unavailable.
  • WP_MEMORY_LIMIT cannot exceed the memory actually granted by PHP/hosting; memory errors require reading memory_limit and peak usage.

Controlled recovery

Isolate the failing plugin or layer, keep logs, then re-enable one component at a time.

define('WP_DEBUG', true);
define('WP_DEBUG_LOG', true);
define('WP_DEBUG_DISPLAY', false);

Topic-specific pitfalls

  • Deleting .maintenance, a plugin or cache without recording initial state can make the symptom disappear without explaining the cause.
  • A redirect loop can come from WordPress, proxy/CDN, HTTPS or a plugin: check each layer separately.

How to validate

  • The site loads with clean logs and the failing component is identified, not merely disabled.
  • Temporary debug constants are removed or adjusted after the intervention.
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