A few questions about PHP memcache

Question

1)
I understand that I can call it

$memcache_obj = memcache_connect('memcache_host', 11211);

in the header files of my site without affecting pages that do not use memcache but how about this

$memcache->connect('127.0.0.1', 11211);

Should this be called on page by page?

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2)
what if the server does not have enough memory to write new caches, and memcache tries to save the cache?

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3)
I know that keys can have up to 30 days of life. Is there a way to reset all keys from memory, especially useful for the testing phase?

4)
Also this code, the first variable is connected, for example, if I have 5 sections on the page that add / update / delete from memcache, do I need to start this connection every time, or can I connect 1 time and do everything to load the page?

memcache_set($memcache_obj, 'var_key', 'some variable', 0, 30)

5) -, , php-?

Answer 1

• , , .., . (EDIT: "memcached" , , "memcache" memcache, )

• memcache ,

• $memcache_obj- > ();

• script,

• $memcache_obj- > getStats() http://www.php.net/manual/en/function.memcache-getstats.php

Answer 2

, , :

2) , 1 ( ) , memcache FALSE. FALSE, - .

3) > 30 (TTL). TTL TTL. , - ( ):

$ttl = 60*60*24*60; // 60 days
$newTTL = time()+$ttl;
memcache_set($memcache_obj, 'cache_key', 'some data', 0, $newTTL)

5) PHP, memory_get_usage() , . Memcache , getStats() .

Answer 3

• http://uk3.php.net/manual/en/function.memcache-connect.php , memcache_connect() Memcache connect()
• http://code.google.com/p/memcached/wiki/FAQ#What_is_memcached%27s_cache? : " , , ".
• memcached flush, .