my-plugin-options-class.php

<?php 

/**
 * Class that contains all the options for my plugin. This class can be used as an
 * ordinary PHP object (stdClass)
 * 
 * @requires PHP version >= 5.1, WordPress version >= 1.6
 * @package MyPlugin
 * @since 0.1
 */
class MyPlugin_Options implements IteratorAggregate {

  public static function get($name, $default=false, $ns = null) 
  {
    $obj = new self($ns);
    $val = $obj->$name;
    if($val === false && $default !== false) 
      $val = $default;
    return $val;
  }

  public static function set($name, $val, $ns=null) 
  {
    $obj = new self($ns);
    $obj->$name = $val;
  }

  private $opt_name;
  private $options;  

  public function __construct($ns = null) 
  {
    if($ns === null)
      $ns = plugin_basename(__FILE__);
    $this->opt_name = 'plugin_auto_options_'.$ns;
    $this->options = get_option($this->opt_name, array());
  }

  public function __get($name) 
  {
    return $this->exists($name) ? $this->options[$name] : false;
  }

  public function __set($name, $val) 
  {
    if($val === null) {
      $this->delete($name);
    } else {
      $this->options[$name] = $val;
      update_option($this->opt_name, $this->options);
    }
  }
  
  public function __isset($name)
  {
    return $this->exists($name);
  }

  public function __unset($name)
  {
    $this->delete($name);
  }

  public function exists($name) {
    return isset($this->options[$name]);
  }

  public function deleteAll() {
    delete_option($this->opt_name);  
  }

  public function delete($name) {
    if( $this->exists($name) ) {
      unset($this->options[$name]);
      update_option($this->opt_name, $this->options);
    }
  }
  
  public function getIterator() 
  {
    return new ArrayIterator($this->options);
  }

}


// Use this class as an ordinary php object (stdClass)

$options = new MyPlugin_Options();

$options->some_option = 'My value'; // the value can be of any type

if( isset($options->other_option) ) { 
  unset( $options->other_option );
}

if( $options->perhaps_an_option ) { // trying to access undefined options will return false (no error triggered)
  //...
}

foreach( $options as $opt_name => $val) { // tou can traverse the option object as if it were an array
  // ...
}


// Static short hand functions
MyPlugin_Options::get('some_option', 'default value');  
MyPlugin_Options::set('some_option', null); // setting the option to null will remove it