Php code to limit the speed of file downloads _ PHP Tutorial-php Tutorial

Php implements code instances that limit the speed of file downloads. Sometimes you want to slow down the download speed for some purpose. for example, you want to implement the file download progress bar function. The biggest advantage of limiting the download speed is to save bandwidth and avoid downloading files for some purpose. for example, you want to implement the file download progress bar function. The biggest advantage of limiting the download speed is to save bandwidth and avoid network congestion caused by excessive instantaneous traffic.

Analysis: The above example limits the file download speed to kb/s, that is, only a KB file stream is sent to the client every second until the complete file is sent. If there is no such restriction, the file will be sent together to the client in the form of a stream. how many messages will be sent? what will happen? If the file size is 2 MB, the 2 MB data stream will be transferred at once, which may cause network congestion and interrupt script execution. this download method cannot be used in practical applications.

Technically, first add the header file and declare Content-Type as application/octet-stream. This indicates that the request will be sent as a stream and the Content-Length is declared, the file stream size is declared. The flush () function is used in the code to refresh the buffer of the php program and implement print dynamic output.

The above code can be cleverly used to display the file download progress bar on the client. if you are interested, try it.

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Bytes. The biggest advantage of limiting the download speed is to save bandwidth and avoid it...