PHP files type checking
<p>Some weird case when I tried a simple php code to check the file type and it couldn't pass through. Any mistake from the below code ? Thanks in advance.</p>

<pre><code>if(($_FILES["file"]["type"]!="image/jpeg")||
            ($_FILES["file"]["type"]!="image/gif")||
            ($_FILES["file"]["type"]!="image/png")){
            echo "File must be in format of jpeg,gif or png.";
        }
</code></pre>
