How to Avoid the \"Array to String Conversion Error\" When Posting Multidimensional Arrays via PHP and CURL?

Posting Multidimensional Arrays with PHP and CURL

When attempting to submit data from a form via CURL, users may encounter the "Array to string conversion error." This occurs when posting multidimensional arrays to a PHP script running on a different server. Since CURLOPT_POSTFIELDS requires an array, users cannot utilize traditional methods such as http_build_query().

Solution

To resolve this issue, a custom function called "http_build_query_for_curl" is necessary. This function traverses the multidimensional array and converts it into a format suitable for CURL.

<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>

Usage

To utilize this function, assign the multidimensional array to a variable and pass it as the first argument to the function. The second argument is an empty array that will hold the converted data. The third argument is optional and specifies the prefix for array keys.

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


http_build_query_for_curl( $arrays, $post );

print_r($post);</code>

The output of this code is:

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

This converted array can now be used with CURLOPT_POSTFIELDS without encountering the conversion error.

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