PHP implementation users click download to jump out of the download page

How does PHP enable users to click download to jump out of the download page ?? [Img = http: //] [/img]. for example, click here to download! Allows you to download images. how does PHP enable users to click to download and jump out of the download page?
How does PHP enable users to click download to jump out of the download page ?? [Img = http: //] [/img]. for example, click here to download! You can download images and share them:
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Header download
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Header ("Content-Type: text/csv ");
Header ("Content-Disposition: attachment; filename = $ file ");
Readfile ("$ filename ");

$ File is the file name $ filename is the file directory
Header ("Content-Type: text/csv"); this format depends on your needs