Скачать или смотреть How to Retrieve and Display Blob Images from MySQL with PHP

Discover how to effectively retrieve and display blob images stored in MySQL using PHP. This guide walks you through the process with clear examples and explanations.
---
This video is based on the question https://stackoverflow.com/q/69249779/ asked by the user 'Michael' ( https://stackoverflow.com/u/13102088/ ) and on the answer https://stackoverflow.com/a/69249808/ provided by the user 'chandirasekaranid' ( https://stackoverflow.com/u/3448657/ ) 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: Retrieve and display blob images from MySQL

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.
---
Introduction

Displaying images stored in a MySQL database can be quite challenging, especially when dealing with blob data types like MEDIUMBLOB. It's common for developers to run into issues while trying to fetch and display these images on a webpage. If you've been struggling with this task, you’re not alone! In this guide, we break down the process step by step so you can easily retrieve and display blob images in your web application.

Understanding the Problem

Let's say you have blob images stored in your MySQL database as MEDIUMBLOB. You've successfully retrieved other metadata about these images, such as the name, type, and size, but the actual image is not displaying correctly on your webpage. Common issues arise due to improper encoding or incorrect HTML syntax when generating the <img> tag.

Sample Code Issue

Here’s a snippet of code illustrating how you might initially try to fetch and display the images:

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

This snippet, while mostly correct, misses a critical step in encoding the image content for proper rendering in HTML.

The Solution

To display the image correctly, you need to encode the image blob into base64 format. This allows the image to be included directly in the HTML without needing a direct URL to an image file. Here's how to do it:

Step 1: Base64 Encoding

Modify the image output code in your loop to include base64_encode() function. Replace the previous image tag line with the following:

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

Explanation:

Base64 Encoding: This function converts binary data into a base64 string which can safely be placed into an HTML image src attribute.

Image Type: Ensure the correct MIME type (like image/jpeg or image/png) is mentioned to render the image properly.

Step 2: Putting It Together

Your updated code should look something like this:

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

Conclusion

With these modifications, you should be able to successfully retrieve and display blob images from your MySQL database on your webpage. The key takeaway is properly using base64_encode() to ensure that the image data is interpreted correctly by the browser. No more blank images or broken links!

Feel free to leave a comment if you have any questions or need further assistance with display issues or other programming challenges!