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POPHP Upload File Validation
 

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    <p>I am creating file upload script and I'm looking for the best techniques and practices to validate uploaded files.</p> <p>Allowed extensions are:</p> <pre><code>$allowed_extensions = array('gif','jpg','png','swf','doc','docx','pdf','zip','rar','rtf','psd'); </code></pre> <p>Here's the list of what I'm doing.</p> <ol> <li><p>Checking file extension</p> <pre><code>$path_info = pathinfo($filename); if( !in_array($path_info['extension'], $allowed_extensions) ) { die('File #'.$i.': Incorrent file extension.'); } </code></pre></li> <li><p>Checking file mime type</p> <pre><code>$allowed_mimes = array('image/jpeg','image/png','image/gif','text/richtext','multipart/x-zip','application/x-shockwave-flash','application/msword','application/pdf','application/x-rar-compressed','image/vnd.adobe.photoshop'); if( !in_array(finfo_file($finfo, $file), $allowed_mimes) ) { die('File #'.$i.': Incorrent mime type.'); } </code></pre></li> <li><p>Checking file size.</p></li> </ol> <p>What should I do to make sure uploaded files are valid files? I noticed strange thing. I changed .jpg file extension to .zip and... it was uploaded. I thought it will have incorrect MIME type but after that I noticed I'm not checking for a specific type but if a specific MIME type exist in array. I'll fix it later, that presents no problems for me (of course if you got any good solution/idea, do not hesitate to share it, please).</p> <p>I know what to do with images (try to resize, rotate, crop, etc.), but have no idea how to validate other extensions.</p> <p>Now's time for my questions.</p> <ol> <li>Do you know good techniques to validate such files? Maybe I should unpack archives for .zip/.rar files, but what about documents (doc, pdf)?</li> <li>Will rotating, resizing work for .psd files?</li> <li>Basically I thought that .psd file has following mime: application/octet-stream but when </li> </ol> <p>I tried to upload .psd file it showed me (image/vnd.adobe.photoshop). I'm a bit confused about this. Do files always have the same MIME type?</p> <p>Also, I cannot force code block to work. Does anyone have a guess as to why?</p>
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