How to Post Multidimensional Arrays via PHP and CURL?

Posting Multidimensional Arrays with PHP and CURL

Problem:

Posting a multidimensional form array via CURL to a PHP script on a different host results in an "Array to string conversion" error. The third argument of curl_setopt() must be an array to set the Content-Type header to multipart/form-data due to file upload. However, it seems that CURLOPT_POSTFIELDS does not support multidimensional arrays.

Solution:

Despite the limitation of CURLOPT_POSTFIELDS, there is a workaround using the http_build_query_for_curl() function. This function recursively converts a multidimensional array into a flat array suitable for curl_setopt().

Example Code:

<code class="php">function http_build_query_for_curl( $arrays, &amp;$new = array(), $prefix = null ) {

    if ( is_object( $arrays ) ) {
        $arrays = get_object_vars( $arrays );
    }

    foreach ( $arrays AS $key => $value ) {
        $k = isset( $prefix ) ? $prefix . '[' . $key . ']' : $key;
        if ( is_array( $value ) OR is_object( $value )  ) {
            http_build_query_for_curl( $value, $new, $k );
        } else {
            $new[$k] = $value;
        }
    }
}

$arrays = array(
    'name' => array(
        'first' => array(
            'Natali', 'Yura'
        )
    )
);


http_build_query_for_curl( $arrays, $post );

print_r($post);</code>

Output:

Array
(
    [name[first][0]] => Natali
    [name[first][1]] => Yura
)

This flat array can then be passed to curl_setopt() as the third argument, successfully posting the multidimensional array via CURL.

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