I wanna to sum bandwidth of each user during download the file . I use php download and resumable or limit speed download . But i have a problem , i don't know to how find download speed or transfer rate of user when during download from my site .
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From the answer of PHP Download file, limit max speed and calculate downloading speed, there is not a simple way to calculate the download speed by php. While to calculate the download speed on the client side it's easy, you can refer to How to detect internet speed in Javascript?. So you can ajax to polling the download speed to server, when the user downloading the file.
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