form_open_multipart([$action = ''[, $attributes = array()[, $hidden = array()]]])
Parameters:
$action (string) – Form action/target URI string
$attributes (array) – HTML attributes
$hidden (array) – An array of hidden fields’ definitions Returns:
An HTML multipart form opening tag Return type:
string
This function is absolutely identical to form_open() above, except that it adds a multipart attribute, which is necessary if you would like to use the form to upload files with.