if (!function_exists('set_multi_value')) {

    /**
     * Repopulate form values when a muli-dimensional post array key is used.
     *
     * @param string $field
     * @param string $index
     * @param string $default
     * @return string 
     */
    function set_multi_value($field, $index=null, $default=null) {
        $CI = & get_instance();
        if ($_SERVER['REQUEST_METHOD'] == 'POST') {
            if (preg_match('/^([a-z0-9_-]+)\[([0-9]+)\]$/i', $field, $matches)) {
                return $CI->security->xss_clean($_POST[$matches[1]][$matches[2]]);
            } elseif (!is_null($index)) {
                return $CI->security->xss_clean($_POST[$field][$index]);
            } elseif (is_null($default)) {
                return $CI->security->xss_clean($_POST[$field]);
            } else {
                return $CI->security->xss_clean($default);
            }
        } elseif (!is_null($default)) {
            return $CI->security->xss_clean($default);
        } else {
            return '';
        }
    }

}

if (!function_exists('set_multi_value')) {

    function set_multi_value($field, $index=null, $default=null) {
        if ($_SERVER['REQUEST_METHOD'] == 'POST') {
            $CI = & get_instance();
            if (preg_match('/^([a-z0-9_-]+)\[([0-9]+)\]$/i', $field, $matches)) {
                return $CI->security->xss_clean($_POST[$matches[1]][$matches[2]]);
            } elseif (!is_null($index)) {
                return $CI->security->xss_clean($_POST[$field][$index]);
            } elseif (!is_null($default)) {
                return $CI->security->xss_clean($_POST[$field]);
            } else {
                return $CI->security->xss_clean($default);
            }
        }
    }

}

if (!function_exists('set_multi_value')) {

    function set_multi_value($field, $index=null) {
        if ($_SERVER['REQUEST_METHOD'] == 'POST') {
            $CI = & get_instance();
            if (preg_match('/^([a-z0-9_-]+)\[([0-9]+)\]$/i', $field, $matches)) {
                return $CI->security->xss_clean($_POST[$matches[1]][$matches[2]]);
            } elseif (!is_null($index)) {
                return $CI->security->xss_clean($_POST[$field][$index]);
            } else {
                return $CI->security->xss_clean($_POST[$field]);
            }
        }
    }
}

if (!function_exists('set_multi_value')) {

    function set_multi_value($field, $index=null) {
        $CI =& get_instance();
        if (preg_match('/^([a-z0-9_-]+)\[([0-9]+)\]$/i', $field, $matches)) {
            return $CI->security->xss_clean($_POST[$matches[1]][$matches[2]]);
        } elseif (!is_null($index) ) {
            return $CI->security->xss_clean($_POST[$field][$index]);
        } else {
            return $CI->security->xss_clean($_POST[$field]);
        }
    }

}

CodeIgniter Helper function to repopulate form values when a muli-dimensional post array key is used.

CodeIgniter Helper Function: set_muli_value

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