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PODetermine extension type using image stream
 

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    <p>I am developing an API system for my uploading service (in PHP). At the current moment I support the option to send image data as binary data from file_get_contents, fread, etc, or by encoding it with 64 based system. I am attempting to determine the extension type of the image being uploaded to my service from this binary/base64 data. If it is base64 then I decode it and then process it. </p> <p>I have the following at the moment:</p> <pre><code>// We need to figure it out ourselves if ($type === "") { // Let's see if it is a base64 file $base64 = $this-&gt;checkBase64Encoded($file_data); // We got a 64 based file or binary $type = $base64 === TRUE ? "base64" : "binary"; } if ($type == "binary") { $im = imagecreatefromstring($file_data); } </code></pre> <p>I want to see if it is possible to determine the image extension type for saving the file. What do you guys suggest? I read something about using getimagesize()? Although I am not sure about this. Is there no way to get around temporarily saving the file, processing it, and then renaming it?</p> <p>I also planned to use this to test that the image was a valid image before i checked for extension but I wasn't exactly sure how to use the getimagesize() function:</p> <pre><code>try { // Get the width and height from the uploaded image list($width, $height) = getimagesize($file['tmp_name']); // I'm not sure what to put here instead of $file['tmp_name'] } catch (ErrorException $e) { // Ignore read errors } if (empty($width) OR empty($height)) { // Cannot get image size, cannot validate return FALSE; } </code></pre> <p>Please feel free to ask for any clarifications if I was unclear. Thanks so much :)</p>
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    1. USMasterGberry
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    1. COmaybe this will help you: http://en.wikipedia.org/wiki/Magic_number_(programming)
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