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    <p>Well the Information in <code>$_SESSION</code> is just stored as a serialized string on the disk. (If you don't use something like memcached session storage)</p> <p>So reading in that file, unserializing it's contents, changing the appropriate values and then serializing it back should be pretty much everything you need.</p> <hr> <p>If you don't want to deal with that you could set the <code>session_id()</code> before <code>session_start()</code>, then edit the values using php and then call <code>session_write_close()</code> to store it on disk again.</p> <hr> <p>Sample script for the session id:</p> <pre><code>&lt;?php session_id("838c4dc18f6535cb90a9c2e0ec92bad4"); session_start(); var_dump($_SESSION); $_SESSION["a"] = "foo"; session_write_close(); </code></pre> <p>Sample script for the unserialisation (<a href="http://www.php.net/manual/en/function.unserialize.php#44837" rel="nofollow">function taken from the comments on the unserialze php.net page</a>)</p> <pre><code>&lt;?php session_save_path("./session"); session_start(); $_SESSION["x"] = 1; $id = session_id(); var_dump($id); session_write_close(); $session = file_get_contents("./session/sess_$id"); var_dump($session); function unserialize_session_data( $serialized_string ) { $variables = array( ); $a = preg_split( "/(\w+)\|/", $serialized_string, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE ); for( $i = 0; $i &lt; count( $a ); $i = $i+2 ) { $variables[$a[$i]] = unserialize( $a[$i+1] ); } return( $variables ); } var_dump(unserialize_session_data($session)); </code></pre> <p>Putting it back together isn't hard ether.</p>
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    1. COI don't think serializing and unserializing will be necessary, an editor should just be able to session_start, make the changes, then session_commit before doing any actual output. basic approach looks sound though.
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    2. COI've added that for that case that you wanted to to change many sessions and not "session_start/open" each one :)
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    3. COThat's a good idea, but for now I only need to edit the session that I'm surrently attached to.
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