How to Display AJAX Upload Progress with PHP?

Displaying AJAX Upload Progress

In AJAX-driven file uploads, extended processing times can lead to user frustration. To address this, displaying progress updates is essential. This article delves into the challenge of updating a element for real-time feedback to users.

Central to this solution is the execution class's $progress property, which tracks progress increments in a 1-100 range. The get_progress() method provides access to this progress value. However, the crux of the issue lies in how to seamlessly update the front-end element using AJAX.

Although AJAX is the preferred solution, due to limitations in object instance access across different environments, a different approach is required. Instead of JavaScript-based AJAX, we propose a server-side progress tracking mechanism that utilizes PHP.

The PHP script presented below encompasses two progress bars, demonstrating the process of incrementally iterating through arrays and displaying the progress in HTML spans. Each span is positioned absolutely with a z-index that corresponds to its current progress status, allowing the bars to stack vertically.

By modifying the outputProgress() function to accept current and total progress values, the script dynamically generates the percentage and updates the spans. Additionally, the myFlush() function ensures that the output buffer is flushed after each iteration, enabling real-time progress updates for the user.

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