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update : 2015.11.03
 
php.shukuma.com검색:
  
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Memcached::casByKey(PECL memcached >= 0.1.0) Memcached::casByKey — Compare and swap an item on a specific server 설명
   public bool Memcached::casByKey
    ( float  
  $cas_token
   , string $server_key
   , string $key
   , mixed $value
   [, int $expiration
  ] )
   Memcached::casByKey() is functionally equivalent to
   Memcached::cas(), except that the free-form
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