PHP Online file analyzing
<p>I'm looking for some tutorial on how from a webapplication upload a file and while uploading analyzing it.</p>

<p>I mean a user chooses a file from his computer on a web app, the file is excel. After choosing elaborate it the file is analyzed and some stuff is done, once the work is complete the user is redirect to  a webapp with the results.</p>

<p>I need just some hints on where to start investigating.</p>

<p>Many thanks!</p>
