WordPress install.php dropin example

install.php

<?php
echo 'This has been customized!!!';

// Perform post-install customizations
if ( function_exists( 'add_action' ) ){
	add_action( 'wp_mail_content_type' , customize_install );
	function customize_install(){
		
		// Switch themes
		switch_theme('twentytwelve');
		
		// Default the timezone
		update_option( 'timezone_string', 'Pacific/Auckland' );
		
		// Increase the Size of the Post Editor
 		update_option( 'default_post_edit_rows', 40 );
 		
		// Remove Hello Dolly 
		delete_plugins( array('hello.php') );

    		// Remove default hello world post
        	wp_delete_post(1,true);

		// Remove default sample page
		wp_delete_post(2,true);

		// Remove default Mr.Wordpress comment
      		wp_delete_comment( 1, true ) ;
      	
      		// Activate Akismet
      		activate_plugin( WP_PLUGIN_DIR . '/akismet/akismet.php' );
      	
		// Update Permalinks
		update_option( 'selection','custom' );
		update_option( 'permalink_structure','/%post_id%/%postname%/' );
		global $wp_rewrite;
		$wp_rewrite->flush_rules();
		
		// Prevent new website notice
		global $phpmailer;
		$phpmailer = new PHPMailer(); // reset
	}
}