in using WordPress During the process of uploading images to your website, you may encounter this error: "temp-write-test failed" or "Unable to create temporary file". This problem often occurs when installing plug-ins, updating themes, uploading images and other operations, affecting the normal operation of the site. In this article, we will introduce the causes of this error, and provide a complete set of troubleshooting and repair programs to help solve the problem as soon as possible.

Common Error Scenarios

• Failed to install plugin
• Error when uploading media files
• WordPress update not working
• Interruptions during batch import and export

All of these operations involve reading and writing temporary files behind the scenes, so once WordPress fails to write to a temporary directory, it triggers a related error.

Possible causes

1. Server's temporary directory is not writable or the path is set incorrectly
2. wp-content maybe uploads Improperly set folder permissions
3. PHP (used form a nominal expression) upload_tmp_dir Arguments are empty or point to a non-existent path
4. Security plug-in restricts file write operations
5. Isolation policies for virtual hosts result in restricted access

cure

1. Check PHP's temporary directory settings

Log in to the server to view the current PHP configuration:

php -i | grep upload_tmp_dir

If there is no setting or the path is invalid, you can edit the php.ini Documentation:

upload_tmp_dir = /tmp

Restart the PHP service after making the changes. Example:

sudo systemctl restart php8.1-fpm

2. Customize WordPress Temporary Directory

exist wp-config.php The following is added to the file:

define('WP_TEMP_DIR', dirname(__FILE__) . '/wp-content/temp/').

after that wp-content folder to create a temp Subdirectory:

mkdir wp-content/temp
chmod 755 wp-content/temp

If you are still unable to write, you can test by temporarily setting the permissions to 775 or 777.

3. Amendments to folder permissions

Make sure that the folders required by WordPress have the correct permissions:

chmod -R 755 wp-content
chmod -R 755 wp-content/uploads

If necessary, adjust the user to whom the folder belongs:

chown -R www-data:www-data wp-content

take note of www-data is a common Web user, and may vary depending on the server environment.

4. Disable plug-ins that may cause conflicts

Some security plugins restrict write access, try temporarily disabling them WordfenceThe test is carried out with plugins such as iThemes Security, iThemes Security, etc.

5. Contact the host or change the operating environment

If none of the above methods work, the problem may be due to hosting restrictions. Try contacting your hosting provider to see if they restrict PHP write access, or consider migrating to a more flexible VPS or cloud hosting platforms.

Preventive recommendations

• Prioritize PHP configuration and file permissions when building your website
• Periodically check the status of server directory writes
• Use a well-known host or officially recommended environment for better compatibility
• Avoid frequent changes to server default permissions or directory structure

summarize

"temp-write-test" errors are usually caused by theserver (computer)The solution is to check PHP settings, fix file permissions, specify a temporary directory, and so on. As long as you follow the methods in this article, most of the problems can be quickly located and fixed.

If the problem persists, it is recommended to submit a screenshot of the error report with the server information to the WordPress community or technical forums for further help.

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