Software Developer

APD Toronto

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Even if you could it would not be a great idea. The ideal solution is to have a common code base for shared code and use a workflow to push changes to the places they need to go. Each site gets a copy drawn from a maintained central repository.
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test page : <a href="http://leak.im/29178963/" rel="ugc">http://leak.im/29178963/</a>&nbsp; but the biggest issue is page on same domain must share the same CSS. It almost impossible to be sure the stylesheets doesn't cause bad CSS at the end. IFrame allow you do to go over this issue as you know. Another thing, you should 100% trust the WP site, else you open a gate for some attacks. <pre><code class="code-10 nolinks" id="code-20-43067321-1">&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
 &lt;?php
 libxml_use_internal_errors(true);
 $fullpage = file_get_contents("https://www.experts-exchange.com/questions/29178963/PHP-Cross-Domain-Includes.html");
 $doc = new DOMDocument();
 $doc-&gt;loadHTML($fullpage);
 $links = $doc-&gt;getElementsByTagName("link");
 foreach($links as $link) {
 echo $doc-&gt;saveHTML($link);
 }
?&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;?php
 echo $doc-&gt;saveHTML($doc-&gt;getElementById("header"));
?&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre> 
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Just a note on Leakim's solution. file_get_contents() is not guaranteed to work in this case. Many hosting providers disable external calls for file_get_contents() and similar functions. 
 
To get around this you would need to use cUrl or sockets to get the data from the remote resource. 
 
Also this only allows you to retrieve the rendered page from the remote resource - not the underlying script. As I understand it you want to load the script itself (header and footer) - rather than the rendered result?
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I just saw on YouTube a library called PHP Simple HTML DOM thgat works like jQuery in conjunction with cUrl. 
 
I will just try it now, but now I am thinking that if it work like jQuery then I can store the header and footer as strings and just echo them. WP stores all css and scripts as absolute paths.
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<blockquote>I just saw on YouTube a library called PHP Simple HTML DOM thgat works like jQuery in conjunction with cUrl.</blockquote>if you download it, open it and check lines &gt; 77+ ... <pre><code class="code-1 nolinks" id="code-20-43067828-1">&nbsp; &nbsp;$contents = file_get_contents(
&nbsp; &nbsp; &nbsp;&nbsp;$url,
&nbsp; &nbsp; &nbsp;&nbsp;$use_include_path,
&nbsp; &nbsp; &nbsp;&nbsp;$context,
&nbsp; &nbsp; &nbsp;&nbsp;$offset,
&nbsp; &nbsp; &nbsp;&nbsp;$maxLen
&nbsp; &nbsp;);
</code></pre>
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Still not my idea of a good solution. You might think you are saving yourself some time with integration but it is at the cost of performance. 
 
cURL to another domain, parsing the DOM and outputting the result just so you can share some content between sites is really going about it the wrong way. All you are doing is adding on significant page load time to your site that is doing the cURL. 
 
Take a look at the direction things are going with JAM Stack. Headless CMS workflow deployment. 
 
What you are wanting to do is possible but just because you can do it doesn't mean you should do it.
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I made it work, but I also inherited all errors due to conflicting plugins, so I will try in iFrame
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<div class="content wysiwyg-content">
Hi Experts, 
 
Is it possible to have includes from different domains, assuming proper permissions are set? Sort of what Classic ASP had using VIRTUAL keywords, which I have not done in ages. 
 
Here is my situation... 
 
www.domain.com&nbsp;is a WordPress site on a Linux server. 
sub.domain.com is a custom PHP App on a IIS Server with plesk. 
 
I need sub.domain/module to have same look and feel as www.domain.com, in particular header and footer and any dynamic changes, like new WP Pages added to the menu, which is part of the WP Header. 
 
I'd like to avoid iFrames from www.domain.com&nbsp;as sub.domain.com/module will have pages in different heights, so this is a last resort. 
 
I was thinking, either doing a WP Page template file, or my preferred way would be if from sub.domain.com I can someway call, or include the WP Header and WP Footer? 
 
Perhaps, I can use cURL, JS/jQuery? 
 
Thanks.
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Hi Experts,

Is it possible to have includes from different domains, assuming proper permissions are set? Sort of what Classic ASP had using VIRTUAL keywords, which I have not done in ages.

Here is my situation...

www.domain.com is a WordPress site on a Linux server.
sub.domain.com is a custom PHP App on a IIS Server with plesk.

I need sub.domain/module to have same look and feel as www.domain.com, in particular header and footer and any dynamic changes, like new WP Pages added to the menu, which is part of the WP Header.

I'd like to avoid iFrames from www.domain.com as sub.domain.com/module will have pages in different heights, so this is a last resort.

I was thinking, either doing a WP Page template file, or my preferred way would be if from sub.domain.com I can someway call, or include the WP Header and WP Footer?

Perhaps, I can use cURL, JS/jQuery?

Thanks.

PHP Cross Domain Includes

Active Server Pages (ASP) is Microsoft’s first server-side engine for dynamic web pages. ASP’s support of the Component Object Model (COM) enables it to access and use compiled libraries such as DLLs. It has been superseded by ASP.NET, but will be supported by Internet Information Services (IIS) through at least 2022.

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

jQuery (Core) is a cross-browser JavaScript library that provides abstractions for common client-side tasks such as Document Object Model (DOM) traversal, DOM manipulation, event handling, animation and Ajax. jQuery also provides a platform to create plugins that extend jQuery's capabilities beyond those already provided by the library.

jQuery

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

WordPress is a free and open-source content management system (CMS) based on PHP and MySQL for creating websites and blogs. Features include a plugin architecture, a template system and strong management, customization and search systems; through its dynamic presentation of content, webmasters have the flexibility to create websites easily.

WordPress

The Apache HTTP Server is a secure, efficient and extensible server that provides HTTP services in sync with the current HTTP standards. Typically Apache is run on a Unix-like operating system, but it is available for a wide variety of operating systems, including Linux, Novell NetWare, Mac OS-X and Windows. Released under the Apache License, Apache is open-source software.