PHP download process analysis

Analysis on the process of downloading files from the client server:

 

 

Therefore, we need to set the number of bytes read at a time in the php Code. For example, in the following code, we use $ buffer = 1024 to set the number of bytes read at a time, output Data (that is, returned to the browser)

 

Flowchart:

<? ("Content-type: text/html; charset = UTF-8" = "..jpg" = ("UTF-8", "gb2312", = ['document _ root']. "marcofly/phpstudy/down/" =. (! ("This file does not exist" = (, "r" = ("Content-type: application/octet-stream" ("Accept-Ranges: bytes "(" Accept-Length :". ("Content-Disposition: attachment; filename = ". = 1024 = 0 (! () & <= (, + = (?>

 

Notes:

 

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