PHP, pass parameters from command line to a PHP script

I want to pass parameters from PHP Command Line Interface, and then read in the values using PHP script, something like this:

<?php
  $name1 = $argv[1];    
  echo $name1;
?>

I pass the variable from CLI like this:

C:\xampp\php\php.exe name.php Robby

The above works, I get Robby as the output.

But I want to do something like this:

C:\xampp\php\php.exe name.php -inputFirstName="Robby"

So that the user is well informed to enter the correct parameters in the correct places. What is the appropriate way to parse these parameters?