Create WordPress preview whilst maintaining a holding page.

index.php

<?php

	if ( !isset( $_SESSION ) ) // if no session
	{
		
		session_start(); // begin session
		
	}

	if ( $_SESSION['preview'] == "allow" || $_GET['preview'] == "allow" ) // if preview GET value exists (or preview SESSION)
	{
		
		if ( $_GET['preview'] == "allow" ) {
			
			 $_SESSION['preview'] = "allow"; // create the session - this means you only need to append '?preview=allow' once
			 
		}
		
		if ( $_GET['preview'] == "end" ) { // if the user wishes to exit preview
			
			unset($SESSION);
			session_destroy();
			      
		}
		
		/**
		* Front to the WordPress application. This file doesn't do anything, but loads
		* wp-blog-header.php which does and tells WordPress to load the theme.
		*
		* @package WordPress
		*/
		
		/**
		* Tells WordPress to load the WordPress theme and output it.
		*
		* @var bool
		*/
		define('WP_USE_THEMES', true);
		
		/** Loads the WordPress Environment and Template */
		require( dirname( __FILE__ ) . '/wp-blog-header.php' );
		
 	} else {

    		// this is where your holding page goes
    
	} 

?>

WORDPRESS Live Preview

 
  # WORDPRESS Live Preview
  
  This wrapper allows you to maintain a HTML holding page whislt seetting up a preview of a live WP site.
  This is handy if you tend to work locally and don't intend to set up a remote test environment.
  
  ## Usage
  
  http://www.yourwebsite.com?preview=allow
  http://www.yourwebsite.com?preview=end