How to Submit Multidimensional Array Data via PHP and CURL?

Resolving Multidimensional Array Posting with PHP and CURL

When submitting a form using CURL to a remote PHP script, issues may arise when dealing with multidimensional array data. An "Array to string conversion" error often occurs due to the unsupported structure in CURLOPT_POSTFIELDS.

One way to tackle this challenge is to utilize a custom function, such as the one provided in the response:

<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;
        }
    }
}</code>

This function takes an array as input and recursively flattens it, creating a new array where each value is assigned to a specific key. By passing the arrays to be posted to this function, we obtain a modified array with a compatible structure for CURLOPT_POSTFIELDS.

<code class="php">$arrays = array(
    'name' => array(
        'first' => array(
            'Natali', 'Yura'
        )
    )
);

http_build_query_for_curl( $arrays, $post );</code>

By using the modified $post array, which has a flattened structure, we can successfully submit the multidimensional data via CURL without encountering the conversion error:

<code class="php">curl_setopt($this->ch, CURLOPT_POSTFIELDS, $post);</code>

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