title: PHP command line argument check if its provided or not
body: <p>I have a php script and i want to provide command line argument in it
  example : <code>php index.php 3 something</code>.
  now i want to check if both arguement is provided or not
  if provided then pass "3" (parameter value) to $n
  and "something" 2nd parameter value to $other_variable
  and also check that more then 3 argument are not provided
  3 arguments are</p>