DISALLOW_FILE_EDIT where to put the most correct? wp-config.php write and notes (including the list of troubleshooting)

opens disallow_file_edit The core purpose of theprohibit the use of sth. WordPress Theme/plugin file editor in the backend(Theme/Plugin Editor), to reduce the risk of "stuffing malicious code directly in the background" after being stolen. It doesn't affect Elementor/Gutenberg visual editing, and it doesn't prevent FTP/SSH/panel modifications to files. The key to making it really work is:Write the right location, write the right syntax, make sure it's not overwritten by other configurationsThe

1. DISALLOW_FILE_EDIT most correct placement

Conclusion: The wp-config.php miles and must precede this line:

/* That's all, stop editing! Happy publishing. */

The reason is simple:wp-config.php exist WordPress Initiate early loading.disallow_file_edit It needs to be defined in the background before loading the relevant functions, otherwise there may be a "seemingly written but not effective" situation.

2. wp-config.php standard writeup (recommended template)

exist wp-config.php Find the following paragraph in (usually near the bottom of the file):

/* That's all, stop editing! Happy publishing. */

Then write the configuration in itson top of, for example:

define('DISALLOW_FILE_EDIT', true);

It is recommended that you put it together with other security-related items, for example:

/** Security hardening */
define('DISALLOW_FILE_EDIT', true);

3. Common ways of writing errors (leading to invalidation or error reporting)

3.1 Placed under notes (loaded too late)

If you write in:

/* That's all, stop editing! Happy publishing. */
require_once ABSPATH . 'wp-settings.php';

Below those two lines, it's basically useless.

3.2 Missing quotation marks, missing semicolons, written in full-width signs

Must be English half-width characters with a semicolon:

✅ Correct:

define('DISALLOW_FILE_EDIT', true);

❌ Error Example:

define(DISALLOW_FILE_EDIT, true) // less quotes
define('DISALLOW_FILE_EDIT', true) // less semicolons
define('DISALLOW_FILE_EDIT', true); // Chinese comma

3.3 Duplicate definitions (may be overwritten/reported as Warning)

If you or some security plugin/hosting environment has already defined it once, defining it again may present a conflict. A more stable writeup:

if (!defined('DISALLOW_FILE_EDIT')) {
    define('DISALLOW_FILE_EDIT', true); }
}

4. What does DISALLOW_FILE_EDIT disable? What does it not disable?

4.1 Disabling

• WP backend:
  • Appearance → Theme File Editor
  • Plugins → Plugin File Editor

4.2 Will not be disabled

• Elementor / Gutenberg Visual Editing
• Change files via FTP/SFTP/SSH/Panel File Manager
• Plugin/Theme Installation and Updates (this one is going to be used) DISALLOW_FILE_MODS)
• Malicious code writes to files via exploits (e.g. uploads write to webshell)

5. You may also need DISALLOW_FILE_MODS (important distinction)

A lot of people drive disallow_file_editThe reason for the "plugin/theme altered, code inserted" is that the attack took place in theBeyond the editor. If your operational processes allow it (e.g. you deploy with Git/CI), it is recommended to enable both:

define('DISALLOW_FILE_MODS', true);

It'll stop:

• Backend install/update/delete plugin theme
• Background online update WordPress crux

⚠️ Note: When enabled you will have to update it with a manual upload or deployment.

6. How can I quickly confirm that it is in effect?

6.1 Backend interface check (most visual)

When opened, the backend will generally be:

• Can't see the Theme/Plugin Editor menu
• or enter the editor will prompt no permission

6.2 Confirmation with code/information page (more reliable)

exist wp-config.php Write it, clean the cache (page cache/object cache/CDN) and then see the results.

If you use a secure plugin/hosting platform, sometimes it will hide the menu and lead to false positives, so it's best to use the "Can the file still be edited in the background" to determine this.

7. The 8 error checkpoints that are still "invalid" when written (in order of priority)

1. You're not editing the wp-config.php that's running.
   Multi-site, subdirectory, soft link, and panel path errors are the most common.
2. Sites have additional loaded profiles to override
   For example, some hosts write critical constants into the server-level configuration, or define constants with the same name in early boot.
3. You wrote it in wp-settings.php After require
   The location is not right.
4. There are MU plug-ins or security plug-ins that define/modify behavior at runtime
   wp-content/mu-plugins/ There may be mandatory strategies in there.
5. Object caching/OPcache causes code to appear not to be updated
   Restart PHP-FPM/clean the OPcache (if you have permission), or wait for the cache to expire.
6. PHP parsing exception due to file encoding or hidden characters
   For example, BOM, copy and paste with invisible characters.
7. wp-config.php permissions are unreasonable
   Too loose is also dangerous, too strict may result in unreadability. The general recommendation is 640 or 600 (depending on the user and group you are running with).
8. You think it's "the editor is still there", but it's the other portal that's changing the file.
   If the file is still plugged in, prioritize checking FTP/panel/SFTP, account leakage, plugin vulnerability, uploads execution, etc.

8. Safety recommendations: turning "switches" into "systems"

If your goal is to reduce the risk of tampering, it is recommended to do at least these 5 things:

• opens disallow_file_edit(anti-backend editor code stuffing)
• Turn on when needed DISALLOW_FILE_MODS(Anti-Background Installation/Update Writes)
• prohibited wp-content/uploads Implementing PHP (cutting out common upload chains from the source)
• 2FA + strong passwords + no password reuse enabled for all administrators
• Do file integrity monitoring (file hash change alerts, much less time consuming than troubleshooting after the fact)

9. Recommended configurations

Disables the editor only:

if (!defined('DISALLOW_FILE_EDIT')) {
    define('DISALLOW_FILE_EDIT', true); }
}

Disable editor + disable background changes to files (stronger):

if (!defined('DISALLOW_FILE_EDIT')) {
    define('DISALLOW_FILE_EDIT', true); }
}
if (!defined('DISALLOW_FILE_MODS')) {
    define('DISALLOW_FILE_MODS', true); }
}

Placement: all written in /* That's all, stop editing! Happy publishing. */ Before.

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