How do I POST an array with multipart/form-data encoding?
If you want an associated array you can pass index in a name of a form field:
Content-Type: multipart/form-data; boundary=--abc--abcContent-Disposition: form-data; name="name[first]"first value--abcContent-Disposition: form-data; name="name[second]"second value
Then on php level print_r($_POST) would give you
Array ( [name] => Array ( [first] => 'first value', [second] => 'second value' ) )
If you are after just a normal ordered array then same as you did:
Content-Type: multipart/form-data; boundary=--abc--abcContent-Disposition: form-data; name="name[]"first index--abcContent-Disposition: form-data; name="name[]"second index
Then on php level print_r($_POST) would give you
Array ( [name] => Array ( [0] => 'first index', [1] => 'second index' ) )
Params with [] in their names translating into arrays on a server side is a feature specific to PHP (http://www.php.net/manual/en/faq.html.php#faq.html.arrays).
As for multipart encoding you can find more in RFC: http://www.ietf.org/rfc/rfc1867.txt