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    <p>It is generally a bad habit to check file type using the extension. I can easily create a text file and rename it .jpg According to this code it would suddenly become an actual image. Or even more evil: I might exploit some bug in webbrowsers by creating a fake jpg that actually executes some code.</p> <p>Besides that, I might name my jpeg files JPEG, jPG, jpG, JPeg or any other combination you might think of. Then there's also other formats than jpeg. I don't know the rest of your code, but maybe you want someone to allow uploading png or gif images.</p> <p>If you want to be a little more sure that you actually have an image file, a more sure way to check is using <a href="http://php.net/getimagesize" rel="nofollow noreferrer">getimagesize</a>. That does require the GD extension though. If that function provides you with output that seems likely to be real you're a whole lot safer using that file as an image. Sure there are cases when you don't care and just want to check for the extension of a file. But I get a feeling this code is supposed to get a little public. A little example:</p> <pre><code>&lt;?php $file = $row['dfilepath']; // where upload_dir is a function that somehow finds // the absolute path of the upload dir $path = upload_dir() . DIRECTORY_SEPARATOR . $file; $valid = array('image/jpeg', 'image/gif', 'image/png'); $info = getimagesize($path); if($info !== false &amp;&amp; in_array($info['mime'], $valid) { // more likely you'll actually have an image here // now you might want to print some html here, like: ?&gt;&lt;img src="/uploads/&lt;?php print $file; ?&gt;" alt="" /&gt;&lt;?php } ?&gt; </code></pre>
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    1. POwhether this php syntax is correct?
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    1. USRuben
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