<?php
/*
Plugin Name: Example Options
Plugin URI: http://bueltge.de/
Description: Options in WordPress 2.8 and higher, register_setting() API
Author: Frank B&uuml;ltge
Author URI: http://bueltge.de/
*/

if ( !function_exists('add_action') ) {
    header('Status: 403 Forbidden');
    header('HTTP/1.1 403 Forbidden');
    exit();
}

if ( function_exists('add_action') ) {
    //WordPress definitions
    if ( !defined('WP_CONTENT_URL') )
        define('WP_CONTENT_URL', get_option('siteurl') . '/wp-content');
    if ( !defined('WP_CONTENT_DIR') )
        define('WP_CONTENT_DIR', ABSPATH . 'wp-content');
    if ( !defined('WP_PLUGIN_URL') )
        define('WP_PLUGIN_URL', WP_CONTENT_URL.'/plugins');
    if ( !defined('WP_PLUGIN_DIR') )
        define('WP_PLUGIN_DIR', WP_CONTENT_DIR.'/plugins');
    if ( !defined('PLUGINDIR') )
        define( 'PLUGINDIR', 'wp-content/plugins' );
    if ( !defined('WP_LANG_DIR') )
        define('WP_LANG_DIR', WP_CONTENT_DIR . '/languages');

    // plugin definitions
    define( 'FB_MSO_BASENAME', plugin_basename(__FILE__) );
    define( 'FB_MSO_TEXTDOMAIN', 'mysampleoptions' );
}

if ( !class_exists( 'MySampleOptions' ) ) {
    class MySampleOptions {

        // constructor
        function MySampleOptions() {
            add_action( 'admin_init',
                                    array(&$this, 'example_options_init')
                                );
            add_action( 'admin_menu',
                                    array(&$this, 'example_options_add_page')
                                );
        }
        
        // Plugin options initialisieren
        function example_options_init() {
            register_setting( 'example_options',
                                                'example_name',
                                                array(&$this, 'example_options_validate')
                                            );
        }
        
        // Menu page Seite hinzufuegen
        function example_options_add_page() {
            add_options_page( __( 'Example Options', FB_MSO_TEXTDOMAIN ),
                                                __( 'Example Options with WP 2.8',
                                                        FB_MSO_TEXTDOMAIN ),
                                                'manage_options', 'example_options',
                                                array(&$this, 'example_options_do_page')
                                            );
        }
        
        // HTML, Simple Options Page
        function example_options_do_page() {
            ?>
            <div class="wrap">
                <h2><?php _e( 'Example Options with WP 2.8',
                                            FB_MSO_TEXTDOMAIN ); ?></h2>
                <form method="post" action="options.php">
                    
                    <?php
                    settings_fields('example_options');
                    $options = get_option('example_name');
                    ?>
                    
                    <table class="form-table">
                        <tr valign="top">
                            <th scope="row">
                                <?php _e( 'A example checkbox', FB_MSO_TEXTDOMAIN ); ?>
                            </th>
                            <td><input name="example_name[myoption1]" type="checkbox" 
                                        value="1" <?php checked('1',
                                        $options['myoption1']); ?> /></td>
                        </tr>
                        <tr valign="top">
                            <th scope="row">A example text</th>
                            <td><input type="text" name="example_name[mytext]"
                                            value="<?php echo $options['mytext']; ?>" /></td>
                        </tr>
                    </table>
                    
                    <p class="submit">
                        <input type="submit" class="button-primary"
                                            value="<?php _e( 'Save Changes',
                                                                                FB_MSO_TEXTDOMAIN ); ?>" />
                    </p>
                    
                </form>
            </div>
            <?php    
        }
        
        // Sanitize und validiere input
        // (Akzeptiert ein array, return ein sanitized array)
        function example_options_validate($input) {
            // erster Wert muss 0 oder 1 sein
            $input['option1'] = ( $input['option1'] == 1 ? 1 : 0 );
            
            // Wert mit text
            $input['sometext'] =  wp_filter_nohtml_kses($input['sometext']);
            
            return $input;
        }
    
    }
        
    // instance class
    $MySampleOptions = new MySampleOptions();
}