Rails query string parsing examples

For jQuery 1.4 $.param()
See http://benalman.com/news/2009/12/jquery-14-param-demystified/

==========
PHP 5.2.11
==========

# print_r( $_GET );

?a=1&a=2&a=3
  
  Array
  (
      [a] => 3
  )

?a[]=4&a[]=5&a[]=6
?a[0]=4&a[1]=5&a[2]=6
  
  Array
  (
      [a] => Array
          (
              [0] => 4
              [1] => 5
              [2] => 6
          )
  
  )

?a[]=4&a[]=5&a[3]=6
  
  Array
  (
      [a] => Array
          (
              [0] => 4
              [1] => 5
              [3] => 6
          )
  
  )

?a[]=4&a[]=5&a[foo]=6

  Array
  (
      [a] => Array
          (
              [0] => 4
              [1] => 5
              [foo] => 6
          )
  
  )

?a[0][]=1&a[0][]=2&a[1][]=3&a[1][]=4

  Array
  (
      [a] => Array
          (
              [0] => Array
                  (
                      [0] => 1
                      [1] => 2
                  )
  
              [1] => Array
                  (
                      [0] => 3
                      [1] => 4
                  )
  
          )
  
  )

===========
RAILS 2.3.4
===========

# rails foo && rm foo/public/index.html && ./foo/script/server
# in browser: http://0.0.0.0:3000/?params

?a=1&a=2&a=3
  
  {"a"=>"3"}

?a[]=4&a[]=5&a[]=6
  
  {"a"=>["4", "5", "6"]}

?a[0]=4&a[1]=5&a[2]=6
  
  {"a"=>{"0"=>"4", "1"=>"5", "2"=>"6"}}

?a[]=4&a[]=5&a[3]=6
  
  ERROR

?a[]=4&a[]=5&a[foo]=6
  
  ERROR

?a[0][]=1&a[0][]=2&a[1][]=3&a[1][]=4
  
  {"a"=>{"0"=>["1", "2"], "1"=>["3", "4"]}}

??? (not possible)
  
  {"a"=>[["1", "2"], ["3", "4"]]}