uploading a file server side
<p>Below is my code where the user can upload a file. What I want to know is that is there a way so that via server side is there a way to first of all restrict the file formats of the files to jpeg and png only and then when the user clicks on the submit button, if the file format is correct then display an alert on the same page stating "File is correct" else display an alert stating "File is incorrect".</p>

<p>Can somebody please provide coding if they know how to do this. Thank you and any help will be much appreciated :)  </p>

<p>
    </p>

<pre><code>&lt;form action="&lt;?php echo htmlentities($_SERVER['PHP_SELF']); ?&gt;" method="post"
enctype="multipart/form-data"&gt;
&lt;label for="file"&gt;Filename:&lt;/label&gt;
&lt;input type="file" name="file" id="file" /&gt;
&lt;br /&gt;
&lt;input type="submit" name="submit" value="Submit" /&gt;
&lt;/form&gt;

&lt;/body&gt;
&lt;/html&gt; 
</code></pre>
