gistfile1.php

<?php  
class ExamplePlugin {
	var $settings = array();
	var $prefix = "example_";
	
	public function __construct() {
		$this->settings = $this->get_settings_obj( $this->prefix );
		add_action('admin_init', array($this, 'save_settings') );
	}
	
	// The Settings Framework
	function get_settings_obj () {
		return get_option("{$this->prefix}settings", false);
	}

	function set_settings_obj ( $newobj ) {
		return update_option("{$this->prefix}settings", $newobj);
	}

	function update_setting ( $option = false, $newvalue ) {
		if( $option === false ) return false;

		$this->settings = $this->get_settings_obj($this->prefix);
		$this->settings[$option] = $newvalue;
		return $this->set_settings_obj($this->settings);
	}

	function get_setting ( $option = false ) {
		if($option === false || ! isset($this->settings[$option]) ) return false;

		return apply_filters($thix->prefix . 'get_setting', $this->settings[$option], $option);
	}

	function add_setting ( $option = false, $newvalue ) {
		if($option === false ) return false;

		if ( ! isset($this->settings[$option]) ) {
			return $this->update_setting($option, $newvalue);
		} else return false;
	}

	function get_field_name($setting, $type = 'string') {
		return "{$this->prefix}setting[$setting][$type]";
	}

	function save_settings()
	{
		if( isset($_REQUEST["{$this->prefix}setting"]) && check_admin_referer('save_sa_settings','save_the_sa') ) {
			$new_settings = $_REQUEST["{$this->prefix}setting"];

			foreach( $new_settings as $setting_name => $setting_value  ) {
				foreach( $setting_value as $type => $value ) {
					if( $type == "array" ) {
						$this->update_setting($setting_name, (array)explode(";", $value) );
					} else {
						$this->update_setting($setting_name, $value);
					}
				}
			}

			add_action('admin_notices', array($this, 'saved_admin_notice') );
		}
	}
	
	// An Admin Page Example
	function admin_page() {
		?>
		<input type="textbox" name="<?php echo $this->get_field_name('email_address'); ?>" value="<?php echo $this->get_setting('email_address'); ?>">
		<input type="submit" value="Save" />
		<?php
	}
}