HTML form with multiple hidden control elements of the same name

Question

Is it legal to have an HTML form with more than one \"hidden\" control element with the same name? I expect to get the values of all of these elements at the server. If it i

Answer 1

Specifically for PHP I made some tests with array names in hidden inputs and I share here my results:

  
    
    
  
  
    

      
      
      
      
      
      
      
      
      
      
      
      
      
      
      
      
      
    
    
<?php
    print_r($_POST);
?>
    
  

Submitting the form generates the next result:

Array
(
[elem] => Array
    (
        ['name'] => Array
            (
                [0] => first
                [1] => second
                [2] => third
                [3] => fourth
            )
        ['type'] => Array
            (
                [0] => normal
                [1] => classic
                [2] => regular
                [3] => basic
            )
        ['size'] => Array
            (
                [0] => 4
                [1] => 7
                [2] => 3
                [3] => 6
            )
        ['temp'] => Array
            (
                [0] => triangle
                [1] => square
                [2] => hexagon
                [3] => circle
            )
    )
[sendtest] => Test
)

After viewing this result I made more tests looking a better arrange of array values and ended with this (I will show only the new hidden inputs):

Obtaining this result after submitting form:

Array
(
[elem] => Array
    (
        [0] => Array
            (
                ['name'] => first
                ['type'] => normal
                ['size'] => 4
                ['temp'] => triangle
            )
        [1] => Array
            (
                ['name'] => second
                ['type'] => classic
                ['size'] => 7
                ['temp'] => square
            )
        [2] => Array
            (
                ['name'] => third
                ['type'] => regular
                ['size'] => 3
                ['temp'] => hexagon
            )
        [3] => Array
            (
                ['name'] => fourth
                ['type'] => basic
                ['size'] => 6
                ['temp'] => circle
            )
    )
[sendtest] => Test
)

I hope this helps a few.