HTML in post_content

I’m exporting all the posts in my blog to an XML file.

As a separate step, in my VB.NET program, I’m reading that XML file, generating a PHP file from it, and executing that PHP file in a Command Prompt window. The PHP file that it’s generating looks like the following:

<?php
  require_once('D:\\Path\\To\\My\\Blog\\wp-config.php');
  $wp->init(); $wp->parse_request(); $wp->query_posts();
  $wp->register_globals(); $wp->send_headers();
  global $wpdb;

  $post1 = array(
    'post_content'   => 'This is a test.',
    'post_title'     => wp_strip_all_tags('My Title'),
    'post_status'    => 'publish',
    'post_type'      => 'post',
    'post_author'    => 1,
    'ping_status'    => 'open',
    'post_parent'    => 0,
    'post_password'  => '',
    'post_excerpt'   => '',
    'post_date'      => '2014-3-27 13:11:40',
    'post_date_gmt'  => '2014-3-27 18:11:40',
    'comment_status' => 'open'
  );

  $post_id1 = wp_insert_post( $post1, $wp_error );
?>

However, instead of one line of post_content, there are multiple lines with HTML markup and other tagging. When I insert the exact post content that I read from the XML file, the PHP file won’t execute.

How do I insert the content into the post_content field of the PHP file? Thanks!