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    <p>It may be because <code>master.php</code> is being included or required by <strong>another script file that is not in the same directory</strong> as <code>header.php</code>. That is, when you visit the index, do you know which file is being invoked/parsed?</p> <p>Take a look at the <a href="http://us3.php.net/manual/en/function.include.php" rel="nofollow noreferrer">documentation</a> for <code>include()</code>, which also applies to <code>require()</code>:</p> <blockquote> <p>Files for including are first looked for in each include_path entry relative to the current working directory, and then in the directory of current script. E.g. if your include_path is libraries, current working directory is /www/, you included include/a.php and there is include "b.php" in that file, b.php is first looked in /www/libraries/ and then in /www/include/</p> </blockquote> <p><strong>Update</strong></p> <p>To address some of the comments: I didn't say that include() would change the CWD. I'm saying that if the CWD is not the one where both master/header.php are located, that could be the issue.</p> <p>For example, say you have <code>index.php</code> in a different folder than <code>master.php</code> and <code>header.php</code>; it includes or requires <code>master.php</code> using the proper path to it. Now, <code>master.php</code> has the statement:</p> <pre><code>&lt;?php require_once("header.php"); ?&gt; </code></pre> <p>However, at this point the CWD <em>does not contain</em> <code>header.php</code>, since the CWD is that of <code>index.php</code>.</p> <p>To fix this, you need to call <code>require_once</code> with the proper path from the CWD of the current script to <code>header.php</code>, NOT the path from <code>master.php</code>.</p>
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    1. COYou can get/check/display the current working directory with getcwd(), http://php.net/getcwd . An include()/require() does _not_ change the cwd, only something like chdir() does.
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    2. COI used getcwd(); and it gave me /Users/MyName/Sites/MySite -- Therefore require_once("Views/header.php"); should work, but it does not. It gives me the same error!
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    3. COAlso, Peter brought up a good point above about master.php being required/included by another script not in the same directory. So I went to http://localhost/~MyName/MySite/Views/master.php and I get the exact same error!
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