Description:
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session_start(); returns TRUE if PHP configured to use mamcached instead of session files and memcached is down/not reachable.

Package php5-cgi:
PHP 5.3.3-7+squeeze17

Package memcached:
Version: 1.4.5-1

Package php5-memcached:
Version: 1.0.2-1+squeeze2

PHP config:
session.save_handler = memcached
session.save_path = "localhost:11211"

Test script:
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$r = session_start();var_dump($r);die();

Expected result:
----------------
bool(false)
Warning: Unknown: Failed to write session data (memcached). Please verify that the current setting of session.save_path is correct (localhost:11211) in Unknown on line 0

Actual result:
--------------
bool(true)
Warning: Unknown: Failed to write session data (memcached). Please verify that the current setting of session.save_path is correct (localhost:11211) in Unknown on line 0