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copied!<p>It could be a good idea define absolute path. Because:</p> <ul> <li>Files/Folders could change location in the future</li> <li>Prevent issues like your question (the parent file could not be the same for different call)</li> <li>If you look the code, you know where you should find the files</li> </ul> <p>So, simply include a constant file where you can generate cascade of path like so:</p> <pre><code>define('PATH_ROOT' ,__DIR__.'/'); define('PATH_CLASSES' , PATH_ROOT.'classes/'); // ... </code></pre> <p>and in your scripts</p> <pre><code>require_once PATH_CLASSES.'controller/Class.CIAjaxHandler.php'; </code></pre> <p>In this case you are absolute sure what you include, and WHERE is the file that you want include.</p> <p>Suppose you've this structure:</p> <p><strong>/root.php</strong></p> <pre><code><?php echo "Hello World"; </code></pre> <p><strong>/index.php</strong></p> <pre><code> <?php include 'path1/path1.php'; </code></pre> <p><strong>/path1/path1.php</strong></p> <pre><code><?php include '../root.php'; </code></pre> <p>In this case if you call <code>/path1/path1.php</code> the script works, because include root.php in parent folder and it's ok. But if you call <code>/index.php</code> it does not works, because the inclusion file is already relative to parent folder.</p> <p>So, if in your software you plan to call different files in different locations, use constants COULD be one solution.</p> <p>Another solution could be set an <a href="http://www.php.net/manual/en/ini.core.php#ini.include-path" rel="nofollow">include path</a> or to specify always an absolute path with <code>__DIR__</code> at start of relative path.</p>

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