pmc-abstract

class-pmc-abstract.php

<?php
abstract class PMC_Base {
	private static $_instance = array();

	protected function __construct() {}

	public static function get_instance() {
		$class = get_called_class();
		if ( ! isset( self::$_instance[$class] ) ) {
			self::$_instance[$class] = new $class();
			self::$_instance[$class]->_init();
		}

		return self::$_instance[$class];
	}

	abstract protected function _init();
}

scratchpad.php

<?php
public static function get_instance( $group = 'general' ) {

	if ( ! is_a(self::$_instance, __CLASS__) ) {
		$class_name = __CLASS__;
		self::$_instance = new $class_name($group);
	}

	return self::$_instance;
}

private function __construct( $group ) {
	$this->post_name = $group;
}

public function init(){
	global $wpdb;
	
	$this->post_id = wp_cache_get( $post_name, 'pmc-long-options' );
	
	if ( ! $this->post_id ) {
		$this->post_id = $wpdb->query( $wpdb->prepare(
			"SELECT ID FROM " . $wpdb->posts . "
			WHERE ...
			LIMIT 1", $post_type, $post_name
		) );
	}
	//pre-populate post meta cache
	get_post_custom( $this->post_id );
}


###################

function pmc_get_option( $name, $group_name = 'general' ){

	$pmc_options = PMC_Options::get_instance( $group_name );
	return $pmc_options->get_option( $name );

}