[php] How to change maximum number of POST variable in PHP?

I'm using WAMP in my local machine, when a FORM(method="POST") with 2000 input fields is submitted I'm able to read only 1001 _POST variable. i.e With Netbeans debugger I can clearly see _POST size is always 1001 if there are more than 1001 input fields in the form.

The same is working fine in another machine(WAMP), where I can see all the POST variables.

Please help me to solve my problem.