Drupal adding an include I am using the Zen theme, what I could like to do is effectly add a php include for a header area. This is common code so a block will not really do. 

I have html.tpl.php which is added automatically to each page is there anyway to add custom chunks to every page for example myheader.tpl.php
You can try module_load_include


  Loads a module include file.


Parameters

$type: The include file's type (file extension).

$module: The module to which the include file belongs.

$name: (optional) The base file name (without the $type extension). If omitted, $module is used; i.e., resulting in "$module.$type" by default.

Examples:

  // Load node.admin.inc from the node module.
  module_load_include('inc', 'node', 'node.admin');
  // Load content_types.inc from the node module.
  module_load_include('inc', 'node', 'content_types');