url rewriting - Rewrite URL of php page to be png -

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i thinking of making tool own development similar placehold.it. have this.

<img src="url.com/picture.php?id=51"/>

to be

<img src="url.com/51.png"/>

any ideas?

edit: though have used stack overflow answer questions , looks stuff up, first time asking question. bit crazy. apparently isn't detailed enough. thought less more , seemed make sense.

anyway... wondering if can make php page behave image. able pass data php page, stuff variables, return content in form of image. example:

this

<img scr="url.com/picture.php?color=blue"/>

could seen browser 

    <img scr="url.com/blue.png"/>

my guess needs done rewrite rule. have done little work in past making pretty urls (www.example.com/some/random/url vs example.com/somerandom.php?a=url) wasn't sure if changing type php png work.

hopefully make sense now.

you can using .htaccess.here rewriterule.

rewriteengine on rewriterule ^([0-9]+).png$ /picture.php?id=$1 [l]

thanks.


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