Beware, if you overwrite the default PHP Session handling and use debugging code inside the write() function, the debugging code is not executed until you run session_write_close().
I tried everything, file logging directly from the write() function, global debugging variable increments, static class properties. The only things written were the session open() and read() calls. My debugging code looks like this:
<?php
$Session = new Session();
...
class Session() {
public function write($id)
$sql = "UPDATE ... WHERE id=". mysql_real_escape_string($id);
self::$debug_Info .= "session_write sql=$sql";
...
}
session_write_close();
error_log($Session->getDebugInfo(), 3, 'logs/sessions.log');
?>
where getDebugInfo simply returns self::$debug_Info. Without session_write_close() the sessions.log would only contain the open() and read() calls.
Maybe intuitive to many, it took days to realize. hope it helps!
