WordPress/wp-admin/post-new.php

<?php
/**
 * New Post Administration Screen.
 *
 * @package WordPress
 * @subpackage Administration
 */

/** Load WordPress Administration Bootstrap */
require_once('./admin.php');

if ( !isset($_GET['post_type']) )
	$post_type = 'post';
elseif ( in_array( $_GET['post_type'], get_post_types( array('show_ui' => true ) ) ) )
	$post_type = $_GET['post_type'];
else
	wp_die( __('Invalid post type') );

if ( 'post' != $post_type ) {
	$parent_file = "edit.php?post_type=$post_type";
	$submenu_file = "post-new.php?post_type=$post_type";
} else {
	$parent_file = 'edit.php';
	$submenu_file = 'post-new.php';
}

$post_type_object = get_post_type_object($post_type);

$title = $post_type_object->labels->add_new_item;

$editing = true;

if ( ! current_user_can( $post_type_object->cap->edit_posts ) )
	wp_die( __( 'Cheatin&#8217; uh?' ) );

wp_enqueue_script('autosave');

// Show post form.
$post = get_default_post_to_edit( $post_type, true );
$post_ID = $post->ID;
include('edit-form-advanced.php');
include('./admin-footer.php');
?>