<div>
Where is the page that is 'including' that file?
</div>


<div>
The php file that has the &quot;require()&quot; is a bit large (750 lines) to include here but I can tell you it's a direct copy of the file in the staging version of the site - that works - except the staging copy has &quot;staging&quot; in the require path. &nbsp;I copied the staging version and then deleted &quot;staging&quot; from the require path to get the live version, that doesn't work.
</div>


<div>
I found the problem. &nbsp;phpinfo() shows that the document root for the live site is <br />
<br />

<pre><code class="code-1 nolinks" id="code-20-41759281-1"><span>/nas/wp/www/sites/bb2</span>
</code></pre>
 not 
<pre><code class="code-1 nolinks" id="code-20-41759281-2"><span>/nas/wp/www/bb2</span>
</code></pre>
<pre><code class="code-1 nolinks" id="code-20-41759281-3"><span>require_once(&quot;/nas/wp/www/sites/bb2/wp-blog-header.php&quot;); </span>
</code></pre>
works.<br />
Thanks for your input. &nbsp;I split the points.
</div>


<div>
You're welcome, glad to help.
</div>


<div>
<div class="content wysiwyg-content">
I've written a PHP file that I use as a template for a WordPress page and &nbsp;I want to refer to some WordPress functions on the page so at the top I have:<br />

<pre><code class="code-1 nolinks" id="code-10-28963790-1"><span>require_once(&quot;/nas/wp/www/bb2/wp-blog-header.php&quot;);</span>
<span> global $wpdb;</span>
</code></pre>
<br />
&quot;/nas/wp/www/bb2/&quot; &nbsp;is the root of my site and I can clearly see that wp-blog-header.php is there in the root:<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/08_w34/1111892/root.jpg" target="_blank" title="Site root (47 KB)"><img alt="Site root" class="file-block lazyload" style="max-width: 261px;" data-src="https://filedb.experts-exchange.com/incoming/2016/08_w34/1111892/root.jpg" /></a><br />
Yet, when the PHP file runs it throws the error: <br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Warning: require_once(/nas/wp/www/b<wbr />b2/wp-blog<wbr />-header.ph<wbr />p): &nbsp;failed to open stream: No such file or directory . . .<br />
<br />
Why doesn't it see wp-blog-header.php?<br />
<br />
I have a staging copy of the site (the site is hosted on WP Engine, where it's easy to create staging sites) and it works there! &nbsp;The only difference is that I included &quot;staging&quot; in the path to wp-blog-header.php:<br />
<br />

<pre><code class="code-1 nolinks" id="code-10-28963790-2"><span> require_once(&quot;/nas/wp/www/staging/bb2/wp-blog-header.php&quot;);</span>
<span> global $wpdb;</span>
</code></pre>
<br />
Does anyone have any idea what could be going on? &nbsp;After half a day looking at this, I'm out of ideas.<br />
<br />
Thanks
</div>
</div>


root.jpg

I've written a PHP file that I use as a template for a WordPress page and  I want to refer to some WordPress functions on the page so at the top I have:
(CODE)

"/nas/wp/www/bb2/"  is the root of my site and I can clearly see that wp-blog-header.php is there in the root:


Yet, when the PHP file runs it throws the error: 

              Warning: require_once(/nas/wp/www/bb2/wp-blog-header.php):  failed to open stream: No such file or directory . . .

Why doesn't it see wp-blog-header.php?

I have a staging copy of the site (the site is hosted on WP Engine, where it's easy to create staging sites) and it works there!  The only difference is that I included "staging" in the path to wp-blog-header.php:

(CODE)

Does anyone have any idea what could be going on?  After half a day looking at this, I'm out of ideas.

Thanks

wp-blog-header.php not found

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

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.