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    <p>Configure each site individually:</p> <pre><code>&lt;?php $cfgsession['file'] = "../sessions_global.txt"; $cfgsession['keepalive'] = 7200; ?&gt; </code></pre> <p>To make multiple sites share sessions, let them use the same <code>$cfgsession['file']</code>. Include a session from one site in a request to another domain (perhaps as recommended by Jack), and as long as you don't catch them making their request in another browser or whatever (please do <i>something</i> to inhibit session hijacking), let them specify a session with $_GET. For example:</p> <pre><code>include ("../session.php"); if (isset($_COOKIE['session'])) session_begin($_COOKIE['session'], $_SERVER['HTTP_USER_AGENT'] . "+" . $_SERVER['HTTP_ACCEPT_CHARSET'], $_SERVER['REMOTE_ADDR']); else session_begin("", $_SERVER['HTTP_USER_AGENT'] . "+" . $_SERVER['HTTP_ACCEPT_CHARSET'], $_SERVER['REMOTE_ADDR']); setcookie("session", session_identity(), 0); </code></pre> <p>And then just roll your own session_ functions:</p> <pre><code>&lt;?php function session_begin($mysession = "", $key = "", $client = "") { global $cfgsession; if (!preg_match("/^[a-z0-9]{32}$/i", $mysession)) $mysession = md5(microtime()); $error = false; $client = trim($client); $key = trim($key); $cfgsession['returning'] = false; if ($chandle = @tmpfile()) { if ($shandle = @fopen($cfgsession['file'], "rb")) { flock($shandle, LOCK_SH); fputs($chandle, $mysession . " " . time() . " $" . $client . " $" . $key . "\n"); while (!feof($shandle)) { $sline = explode(" ", trim(fgets($shandle)), 4); if ($sline[1] &gt;= (time() - $cfgsession['keepalive'])) { if (($sline[0] == $mysession) &amp;&amp; ($sline[3] == "$" . $key)) { $cfgsession['client'] = substr($sline[2], 1); $cfgsession['returning'] = true; } elseif (count($sline) &gt; 2) fputs($chandle, implode(" ", $sline) . "\n"); } } fclose($shandle); fseek($chandle, 0); if ($shandle = @fopen($cfgsession['file'], "cb")) { if (flock($shandle, LOCK_EX)) { ftruncate($shandle, 0); $cfgsession['count'] = 0; while (!feof($chandle)) { $cline = trim(fgets($chandle)); fputs($shandle, $cline . "\n"); $cfgsession['count']++; } } else $error = true; fclose($shandle); } else $error = true; } else $error = true; fclose($chandle); } else $error = true; if (($cfgsession['returning'] == false) &amp;&amp; ($mysession == $cfgsession['session'])) { $cfgsession['returning'] = true; $mysession = md5(microtime()); } $cfgsession['session'] = $mysession; if ($error) return -1; else return 0; } function session_count() { global $cfgsession; return $cfgsession['count']; } function session_client() { global $cfgsession; return $cfgsession['client']; } function session_id() { global $cfgsession; return $cfgsession['session']; } function session_index() { global $cfgsession; $index_return = array(); if ($uhandle = @fopen($cfgsession['file'], "rb")) { flock($uhandle, LOCK_SH); while (!feof($uhandle)) { $uline = explode(" ", trim(fgets($uhandle)), 4); foreach ($uline as &amp;$value) { if ($value[0] == "$") $value = substr($value, 1); } if (count($uline) &gt;= 2) $index_return[] = $uline; } fclose($uhandle); } return $index_return; } function session_returning() { global $cfgsession; return $cfgsession['returning']; } ?&gt; </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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