Handle case insensitive parameter in php

case_insensitive

Using php function array_change_key_case() we can handle case insensitive parameter in php. 

$params = array_change_key_case($_POST or $_GET);

Like your parameter in get request someurl.php?AC=user_info&User=vikas&passWord=123456

so after user array_change_key_case function you get all parametre either in small case or uppar case. if you  want in uppar case we need to pass in fucntion ssecond parameter.
lowercase  is by default.

array_change_key_case($_POST or $_GET , CASE_UPPER);