Removing unused setting in Session configuration.

Fixed bug in CakeSession::watch(); that allowed setting multiple vars to watch and CakeSession::ignore(); would only unset the first one found.
Fixed errors being thrown when testing database sessions and the database was dropped before script process ended.

git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@8103 3807eeeb-6ff5-0310-8944-8be069107fe0

cake/libs/session.php

@@ -349,7 +349,9 @@ function watch($var) {
 		if (empty($var)) {
 			return false;
 		}
-		$this->watchKeys[] = $var;
+		if (!in_array($var, $this->watchKeys, true)) {
+			$this->watchKeys[] = $var;
+		}
 	}
 /**
  * Tells Session to stop watching a given key path
@@ -571,10 +573,8 @@ function _checkValid() {
 				$this->__setError(1, 'Session Highjacking Attempted !!!');
 			}
 		} else {
-			srand ((double)microtime() * 1000000);
 			$this->write('Config.userAgent', $this->_userAgent);
 			$this->write('Config.time', $this->sessionTime);
-			$this->write('Config.rand', mt_rand());
 			$this->write('Config.timeout', 10);
 			$this->valid = true;
 			$this->__setError(1, 'Session is valid');

cake/tests/cases/libs/session.test.php

@@ -369,6 +369,11 @@ function testReadAndWriteWithDatabaseStorage() {
 		$this->Session->destroy();
 		$this->assertFalse($this->Session->read('SessionTestCase'));
 		session_write_close();
+
+		unset($_SESSION);
+		ini_set('session.save_handler', 'files');
+		Configure::write('Session.save', 'php');
+		$this->setUp();
 	}
 }
 ?>