#WordPress #Plugin options page

plugin.php

<?php

// .... various plugin code, then the options page gets added:
// Add settings link to plugins page listing
add_action('admin_menu', 'myplugin_register_options_page');
add_action('admin_init', 'myplugin_register_settings');
$plugin = plugin_basename(__FILE__);
add_filter("plugin_action_links_$plugin", 'myplugin_add_settings_link');

// Settings link on plugin page
function myplugin_add_settings_link($links)
{
    $settings_link = '<a href="options-general.php?page=my-plugin">' . __('Settings') . '</a>';
    array_push($links, $settings_link);
    return $links;
}

// Register Settings For a Plugin so they are grouped together
function myplugin_register_settings()
{
    add_option('myplugin_option_name', '');
    register_setting('myplugin_options_group', 'myplugin_option_name', null);
}

// Create an options page
function myplugin_register_options_page()
{
    add_options_page('My Plugin Settings', 'MyPlugin Settings', 'manage_options', 'my-plugin', 'myplugin_options_page');
}

// Display Settings on Option’s Page
function myplugin_options_page()
{
?>
            <div>
                <h2>My Plugin Settings</h2>
                <form method="post" action="options.php"> 
                    <?php settings_fields('myplugin_options_group'); ?> 

                    <h4>Description of option</h4>
                    <input type="text" id="myplugin_option_name" name="myplugin_option_name" value="<?php echo get_option('myplugin_option_name'); ?>" style="width:40%;" />

                    <?php submit_button(); ?>
                </form>
            </div>
        <?php
}