[PHP] Check RAW data

[rb]

I'm getting from an external source a PNG image in raw format (encoded in 
base64).

And with this code I'll echo on the screen.
------
$img=base64_decode($_POST['img']);

header("Content-type: image/png");
echo $img;
------

How can I check if the data received is a real PNG raw (and not malicious 
code) ? 


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