MEMCACHE.ADDSERVER(3)							 1						     MEMCACHE.ADDSERVER(3)

Memcache::addServer - Add a memcached server to connection pool

SYNOPSIS

       bool  Memcache::addServer  (string   $host, [int  $port = 11211], [bool	$persistent], [int  $weight], [int  $timeout], [int  $retry_inter-
       val], [bool  $status], [callable  $failure_callback], [int  $timeoutms])

DESCRIPTION

       Memcache.addServer(3) adds a server to the connection pool. You can also use the memcache_add_server(3) function.

	When using this method (as opposed to Memcache.connect(3) and Memcache.pconnect(3)) the network connection is not established until  actu-
       ally needed. Thus there is no overhead in adding a large number of servers to the pool, even though they might not all be used.

	Failover  may occur at any stage in any of the methods, as long as other servers are available the request the user won't notice. Any kind
       of socket or Memcached server level errors (except out-of-memory) may trigger the failover. Normal client errors such as adding an existing
       key will not trigger a failover.

       Note

	       This function has been added to Memcache version 2.0.0.

PARAMETERS

	      o $host
		-  Point  to  the  host  where	memcached  is  listening  for  connections.  This parameter may also specify other transports like
		unix:///path/to/memcached.sock to use UNIX domain sockets, in this case $port must also be set to 0.

	      o $port
		- Point to the port where memcached is listening for connections. Set this parameter to 0 when using UNIX domain sockets.   Please
		note:  $port defaults to memcache.default_port if not specified. For this reason it is wise to specify the port explicitly in this
		method call.

	      o $persistent
		- Controls the use of a persistent connection. Default to TRUE.

	      o $weight
		- Number of buckets to create for this server which in turn control its probability of it being selected. The probability is rela-
		tive to the total weight of all servers.

	      o $timeout
		-  Value  in  seconds which will be used for connecting to the daemon. Think twice before changing the default value of 1 second -
		you can lose all the advantages of caching if your connection is too slow.

	      o $retry_interval
		- Controls how often a failed server will be retried, the default value is 15 seconds. Setting this parameter to -1 disables auto-
		matic  retry.  Neither this nor the $persistent parameter has any effect when the extension is loaded dynamically via dl(3).  Each
		failed connection struct has its own timeout and before it has expired the struct will be skipped when selecting backends to serve
		a  request.  Once expired the connection will be successfully reconnected or marked as failed for another $retry_interval seconds.
		The typical effect is that each web server child will retry the connection about every	$retry_interval  seconds  when	serving  a
		page.

	      o $status
		-  Controls  if  the server should be flagged as online. Setting this parameter to FALSE and $retry_interval to -1 allows a failed
		server to be kept in the pool so as not to affect the key distribution algorithm. Requests for this server will then  failover	or
		fail  immediately  depending  on  the  $memcache.allow_failover  setting. Default to TRUE, meaning the server should be considered
		online.

	      o $failure_callback
		- Allows the user to specify a callback function to run upon encountering an  error.  The  callback  is  run  before  failover	is
		attempted. The function takes two parameters, the hostname and port of the failed server.

	      o $timeoutms
		-

NOTES

       Warning

	       When  the  $port is unspecified, this method defaults to the value set of the PHP ini directive memcache.default_port If this value
	      was changed elsewhere in your application it might lead to unexpected results: for this reason it is wise to always specify the port
	      explicitly in this method call.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      Memcache.addServer(3) example

	      <?php

	      /* OO API */

	      $memcache = new Memcache;
	      $memcache->addServer('memcache_host', 11211);
	      $memcache->addServer('memcache_host2', 11211);

	      /* procedural API */

	      $memcache_obj = memcache_connect('memcache_host', 11211);
	      memcache_add_server($memcache_obj, 'memcache_host2', 11211);

	      ?>

SEE ALSO

       Memcache.connect(3), Memcache.pconnect(3), Memcache.close(3), Memcache.setServerParams(3), Memcache.getServerStatus(3).

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