php tools to detect bottle neck
<p>I'm developing a web-application with PHP and some libraries. The problem is that i need to generate some excel files, and this procedure takes a lot of time. Can you help me with some tools to identify where my application spends a lot of time,. Can you recommend a php tool which will help me to detect the bottle necks?</p>

<p>ps: the lib that I use for generating the excel files is <a href="http://www.codeplex.com/PHPExcel" rel="nofollow">PHPExcel</a>. </p>
