Скачать или смотреть How to Properly Handle File Uploads in PHP: Fixing the “Form Upload Files Cannot Be Displayed” Issue

Struggling with file uploads in PHP? Learn how to fix the "form upload files cannot be displayed" problem and ensure smooth file uploads on your website with proper instructions.
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This video is based on the question https://stackoverflow.com/q/63406241/ asked by the user 'buaya laut' ( https://stackoverflow.com/u/13781543/ ) and on the answer https://stackoverflow.com/a/63406286/ provided by the user 'Mohanasundar' ( https://stackoverflow.com/u/13940268/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When working with file uploads in PHP, many developers encounter the frustrating problem of “form upload files cannot be displayed.” This typically occurs when images fail to upload due to incorrect file paths or unsupported file types. If you've found yourself in this situation, fear not! In this guide, we will dissect the common issues surrounding file uploads and provide a comprehensive solution to get your code working seamlessly.

Understanding the Issue

The original code provided includes a simple HTML form that allows users to upload image files. However, when an attempt is made to upload, the following message is shown:

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

This message indicates that the image file is either not of the specified file types (GIF or JPEG) or that there is an issue with how the upload process is structured.

Step-by-Step Solution

To resolve the issue, we need to make our file upload script robust. Here are the necessary steps to ensure successful file uploads.

1. Update the File Path

One of the primary reasons for upload failures can be incorrect paths where the files are saved. Ensure that the directory where you're trying to save uploaded files exists and the script has write permissions. In the revised code, you’ll want to change the $uploaddir variable:

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Make sure to replace ../path-to-move/ with the actual path where you want to store the uploaded files.

2. HTML Form Action

It's crucial to ensure the form submits to the correct action. By using htmlspecialchars($_SERVER['PHP_SELF']), we can safeguard against Cross-Site Request Forgery (CSRF) while ensuring the form submits to the right page. Here is how you can update your form access:

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

3. Validating the File Type

The code checks if the uploaded file is either a GIF or JPEG. This is already in place, but it's important to ensure the MIME type is properly checked and handled. You already have:

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

This portion ensures that only permitted file types are processed.

4. Moving the Uploaded File

Lastly, core to the upload process is the function move_uploaded_file(), which should move the uploaded file to the designated directory. Ensure this is implemented like so:

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

Conclusion

By following these structured steps, you can resolve the “form upload files cannot be displayed” issue effectively. Always remember to check file paths, validate file types, and ensure your PHP environment is set up correctly. A little attention to detail can save a lot of frustration in managing file uploads!

Making sure that your PHP script adheres to these best practices will lead to smoother file handling processes and provide better user experiences on your web projects. Happy coding!