java - PHP image path different for every user -

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hi ive run thought simple obstacle however, become quite hassle want display picture on website different every user logged in. tried 

<img src="<?php echo 'screenshots/img_$username.png' ?>" />

i didnt think work im not sure go on 1 have java application saves images file on users computer uploads them server , saves them "img_someusername.png" username going different every person

how can user logged in see or picture , not else's profile picture on facebook?

try instead.

<img src="screenshots/img_<?php echo $username; ?>.png" />

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