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copied!<p>If the ids are numeric, this is very easy. Assuming the URL for displaying a project is:</p> <pre>http://myserver/project.php?id=3</pre> <p>...you just need to do something like:</p> <p> <pre><code> // Sanitise user input $currentId = (int) $_GET['id']; // Calculate next/prev IDs $nextId = $currentId + 1; $prevId = ($currentId > 1) ? $currentId - 1 : 1; // Make sure the previous ID is not below 1 // Make links $nextLink = "<a href=\"project.php?id=$nextId\">Next</a>"; $prevLink = "<a href=\"project.php?id=$prevId\">Previous</a>"; </code></pre> <p>If you are doing it based on the file names themselves, it's a little more tricky - but only a little. You would need to get a list of files in the directory, and use them instead. Now we'll assume your URL's look like:</p> <pre>http://myserver/project.php?name=somefile</pre> <pre><code><?php // Sanitise user input $currentFile = basename($_GET['name']); // These will hold the previous/next project names $prev = $next = ''; // Loop the directory until we find the current file $dp = opendir('.'); // Open current dir, this can be adjusted to your file structure while (($file = readdir($dp)) !== FALSE) { if (in_array($file, array('.','..')) continue; // Skip . and .. if ($file == $currentFile) { if (($file = readdir($dp)) !== FALSE) { $next = $file; } break; } $prev = $file; } closedir($dp); // Make links if ($next !== '') { $nextLink = '<a href="project.php?name='.htmlspecialchars($next).'">Next</a>'; } else { // Handle no next project here } if ($prev !== '') { $prevLink = '<a href="project.php?name='.htmlspecialchars($prev).'">Previous</a>'; } else { // Handle no previous project here } </code></pre>

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