Скачать или смотреть Solving the file_get_contents Issue in Docker for WordPress

Discover how to fix the `file_get_contents` error when migrating your WordPress site to Docker, allowing for seamless SVG embedding.
---
This video is based on the question https://stackoverflow.com/q/76626690/ asked by the user 'Max Slyusarchuk' ( https://stackoverflow.com/u/14235765/ ) and on the answer https://stackoverflow.com/a/76626742/ provided by the user 'Brad' ( https://stackoverflow.com/u/362536/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Why `file_get_contents` don't work in Docker? How can I solve this issue?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Tackling the file_get_contents Issue in Docker for WordPress

Migrating a WordPress project to Docker can come with its fair share of challenges. One common issue developers encounter involves the file_get_contents function, particularly when trying to embed SVG files in PHP. If you've recently transitioned your project to Docker and are facing errors such as "Failed to open stream: Connection refused", you are not alone. Let’s explore the problem and how to effectively solve it.

Understanding the Problem

When running your project locally, you might have had no trouble using file_get_contents to retrieve your SVG files. However, once you transitioned to Docker, you likely encountered an error like this:

[[See Video to Reveal this Text or Code Snippet]]

What Does This Error Mean?

This error generally suggests that the PHP service running your WordPress instance cannot access the resource specified by the URL you provided. The significant reason behind this issue is the usage of 0.0.0.0, which in Docker signifies that the application should listen on all network interfaces. However, it does not equate to a reachable address for the file_get_contents function.

Steps to Solve the Problem

Let’s break down the solution into actionable steps to ensure your SVG files load properly in your Docker environment.

1. Avoid Using 0.0.0.0

When trying to access resources within your application, using 0.0.0.0 is not advisable. Instead, you should utilize either 127.0.0.1 or localhost. This change indicates that the requests should be made to the local server rather than binding to all interfaces.

2. Accessing Files from the Filesystem

If the SVG file is stored on the filesystem, it’s better to use a filesystem path rather than an HTTP URL. You can achieve this in your code by replacing the usage of file_get_contents with:

[[See Video to Reveal this Text or Code Snippet]]

Explanation

get_template_directory() returns the local path to your active theme, eliminating the need for HTTP URLs altogether.

3. Check Your Docker Configuration

Be sure your docker-compose.yml is correctly set up to manage your WordPress and its resources. Here’s a brief overview of your configuration:

[[See Video to Reveal this Text or Code Snippet]]

In this configuration, ensure that your volumes directive correctly maps your local wp-content directory to the Docker container. This mapping allows your WordPress instance to access your theme files within the container.

4. Verify PHP Settings

You indicated adjusting your PHP configuration in php-extra.ini with the line:

[[See Video to Reveal this Text or Code Snippet]]

While this change is necessary for loading files via HTTP, addressing the URL you are trying to utilize will be more impactful. Ensure that this setting is correctly applied and check for any additional errors that might arise due to misconfigurations.

Conclusion

Migrating your WordPress site to Docker is an excellent step towards a more efficient development workflow, but it does require some adjustments. By avoiding the use of 0.0.0.0 for file retrieval and ensuring that you reference local filesystem paths when possible, you can resolve the file_get_contents issue effectively. Make these adjustments, and you'll find that embedding SVG files returns back to normal, allowing you to progress with your project seamlessly. Happy coding!