Check RAW data

From: Date: Sun, 20 Apr 2008 13:52:13 +0000
Subject: Check RAW data
Groups: php.general 
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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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