Posting multidimensional array with PHP and CURL

Question

I\'m having trouble posting form data via CURL to a receiving PHP script located on a different host.

I get an Array to string conversion error

Answer 1

First I would like to thank Daniel Vandersluis for his insightful reply. Based on his input I came up with this to fix the problem from the original question:

 $value) {
    $final_key = $prefix ? "{$prefix}[{$key}]" : $key;
    if (is_array($value)) {
      // @todo: handle name collision here if needed
      $output += curl_postfields_flatten($value, $final_key);
    }
    else {
      $output[$final_key] = $value;
    }
  }
  return $output;
}

Usage should look like this:

curl_setopt($this->ch, CURLOPT_POSTFIELDS, curl_postfields_flatten($post));

This function will convert arrays like this:

array(
  'a' => 'a',
  'b' => array(
    'c' => array(
      'd' => 'd',
      'e' => array(
        'f' => 'f',
      ),
    ),
  ),
);

Into this:

array(
  'a' => 'a',
  'b[c][d]' => 'd',
  'b[c][e][f]' => 'f',
)

It doesn't handle cases with mixed format when there is a key collision like this:

array(
 'b[c]' => '1',
 'b' => array(
   'c' => '2', 
  ),
);

The output will contain only the first value for that key

array(
 'b[c]' => '1'
)