Error in $_POST

Hi guys , I am getting this error in php ___What I am doing; 1. I am posting data from one form and collecting it for execution as follows $_POST['cust_id[0]']; // cust_id is an array of length 1 which is selected form an drop down menu 2. register_globals is off 3. Also when i try to call an array element in to other array like $first_array=[$second_array[the_index_value]]; I encounter the same problem. ___The error is: Parse error: parse error, unexpected '[', expecting ']' why am i getting this error am i doing some blunders ??? Loads of thanks in advance Regards, V Kashyap