unction arguments

Information may be passed to functions via the argument list, which is a comma-delimited list of expressions.
PHP supports passing arguments by value (the default), passing by reference, and default argument values. Variable-length argument lists are also supported, see also the function references for func_num_args(), func_get_arg(), and func_get_args() for more information.

Example #1 Passing arrays to functions
function takes_array($input)
"$input[0] + $input[1] = ", $input[0]+$input[1];