<?php

//if uninstall not called from WordPress exit
if (!defined('WP_UNINSTALL_PLUGIN')) {
    exit;
}
require_once "ce-plugin-config.php";
$option_name = CE_Plugin_Config::get_options_var_name();
delete_option($option_name);
 public static function get_plugin_setting($field)
 {
     $settings = get_option(CE_Plugin_Config::get_options_var_name());
     if (isset($settings)) {
         return $settings[$field];
     } else {
         return null;
     }
 }
<?php

// Set options property
$this->options = get_option(CE_Plugin_Config::get_options_var_name());
?>
<div class="wrap">
        <h2>Continuing Education Custom Functions Settings</h2>           
        <form method="post" action="options.php">
        <?php 
// This prints out all hidden setting fields
settings_fields(CE_Plugin_Config::get_options_group_name());
do_settings_sections(CE_Plugin_Config::get_options_menu_slug());
submit_button();
?>
        </form>
</div>