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    <p>i would use a bitmask for this: <a href="http://php.net/manual/en/language.operators.bitwise.php" rel="nofollow">http://php.net/manual/en/language.operators.bitwise.php</a></p> <pre><code>&lt;?php // define your types and groups: $listedTypes["TYPE_MSWORD"] = 1; $listedTypes["TYPE_MSEXCEL"] = 2; $listedTypes["TYPE_MSPOWERPOINT"] = 4; $listedTypes["TYPE_OFFICE"] = $listedTypes["TYPE_MSWORD"] + $listedTypes["TYPE_MSEXCEL"] + $listedTypes["TYPE_MSPOWERPOINT"]; $listedTypes["TYPE_HTML"] = 8; $listedTypes["TYPE_SVG"] = 16; $listedTypes["TYPE_W3C"] = $listedTypes["TYPE_HTML"] + $listedTypes["TYPE_SVG"]; $listedTypes["TYPE_ALL"] = $listedTypes["TYPE_OFFICE"] + $listedTypes["TYPE_W3C"]; // try to open the page.php?doctype=TYPE_MSWORD // or page.php?doctype=TYPE_ALL if(!isset($_GET['doctype'])) $_GET['doctype'] = "TYPE_ALL"; if(!isset($listedTypes[$_GET['doctype']])) $_GET['doctype'] = "TYPE_ALL"; $requestedType = $listedTypes[$_GET['doctype']]; foreach ( $files as $file ) { $xml = new SimpleXMLElement( $file, 0, true ); if($xml-&gt;doctype == "......") $fileType = $listedTypes["TYPE_MSWORD"]; elseif($xml-&gt;doctype == ".........") $fileType = $listedTypes["TYPE_MSEXCEL"]; elseif($xml-&gt;doctype == ".........") $fileType = $listedTypes["TYPE_MSPOWERPOINT"]; //... continue // then check if the $type matches the $selection of $_GET['doctype'] // if the filetype is in the requested file type group, it will be shown if($fileType &amp; $requestedType) { echo' &lt;tr&gt; &lt;td id="'. $xml-&gt;doctype .'" name="'. $xml-&gt;doctype .'" class="mainTable"&gt;' . $xml-&gt;doctype . '&lt;/td&gt; &lt;td&gt;&lt;a href="viewdoc.php?docname=' . basename( $file, '.xml' ) . '&amp;username='. $xml-&gt;startedby .'&amp;myname='. $_SESSION['username'] .'"&gt;' . basename( $file, '.xml' ) . '&lt;/a&gt;&lt;/td&gt; &lt;td&gt;&lt;a href="viewprofile.php?name='. $xml-&gt;startedby .'"&gt;'. $xml-&gt;startedby .'&lt;/a&gt;&lt;/td&gt; &lt;td&gt;'. $xml-&gt;date .'&lt;/td&gt; &lt;td&gt;* * * * *&lt;/td&gt; &lt;td&gt;'. filesize( $file ) .'kb&lt;/td&gt; &lt;/tr&gt; '; } } </code></pre>
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