: This article describes how to use flush to continuously update the browser UI and download progress bars for PHP persistent connections. For more information about PHP tutorials, see. How can I use PHP + JS to implement the upload progress bar? most people may have implemented it, but can download it? How? The principle is almost the same, that is, the number of bytes read each time, but the poor is the persistent connection. Generally, two common solutions to achieve the download progress bar are: one is to use socket to maintain communication with the client and maintain persistent connections. use flush () to continuously update the browser UI, return the size of downloaded data, and then display the download speed, and progress bars. The two are php interaction with flash to display progress bars.
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