(PECL memcached >= 0.1.0)
Memcached::set — Store an item
Memcached::set() stores the value
on a memcache server under the specified key. The
expiration parameter can be used to control when the
value is considered expired.
The value can be any valid PHP type except for resources, because those
cannot be represented in a serialized form. If the
Memcached::OPT_COMPRESSION option is turned on, the
serialized value will also be compressed before storage.
keyLa chiave in cui salvare il valore.
valueIl valore da salvare.
expirationLa data di scadenza, il default è 0. Vedere Date di scadenza per ulteriori informazioni.
Restituisce true in caso di successo, false in caso di fallimento.
Utilizzare Memcached:getResultCode() se necessario.
Example #1 Memcached::set() example
<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$m->set('int', 99);
$m->set('string', 'a simple string');
$m->set('array', array(11, 12));
/* expire 'object' key in 5 minutes */
$m->set('object', new stdClass, time() + 300);
var_dump($m->get('int'));
var_dump($m->get('string'));
var_dump($m->get('array'));
var_dump($m->get('object'));
?>Il precedente esempio visualizzerà qualcosa simile a:
int(99)
string(15) "a simple string"
array(2) {
[0]=>
int(11)
[1]=>
int(12)
}
object(stdClass)#1 (0) {
}
@PeterNYou said that this was wrong:$m->set('object', new stdclass, time() + 300);And instead this is the correct way:$m->set('object', new stdclass, 300);When actually, they are both correct. Expiration looks at the time given, if the number is less than or equal to 30 days(60 * 60 * 24 * 30 = 2,592,000), then it expires in that many seconds. If the number is greater than 30 days, then it expires at that UNIX time.Unlike Memcache, Memcached will not replace spaces in keys with underscores for you, and will instead send the key as provided which will cause an error that can result in keys and values being mismatched. You can avoid this problem by removing/replacing spaces before storage or setting the option Memcached::OPT_BINARY_PROTOCOL to true.In the example it shows:/* expire 'object' key in 5 minutes */$m->set('object', new stdclass, time() + 300);But this is wrong.It will not expire, at least, not for a long long time.So instead of time() + seconds, you use:$m->set('object', new stdclass, 300);And it will correctly expire after 5 minutes.Note: Using memcached 2.1.0 stable through PECL.00 = MEMCACHED_SUCCESS01 = MEMCACHED_FAILURE02 = MEMCACHED_HOST_LOOKUP_FAILURE // getaddrinfo() and getnameinfo() only03 = MEMCACHED_CONNECTION_FAILURE04 = MEMCACHED_CONNECTION_BIND_FAILURE // DEPRECATED see MEMCACHED_HOST_LOOKUP_FAILURE05 = MEMCACHED_WRITE_FAILURE06 = MEMCACHED_READ_FAILURE07 = MEMCACHED_UNKNOWN_READ_FAILURE08 = MEMCACHED_PROTOCOL_ERROR09 = MEMCACHED_CLIENT_ERROR10 = MEMCACHED_SERVER_ERROR // Server returns "SERVER_ERROR"11 = MEMCACHED_ERROR // Server returns "ERROR"12 = MEMCACHED_DATA_EXISTS13 = MEMCACHED_DATA_DOES_NOT_EXIST14 = MEMCACHED_NOTSTORED15 = MEMCACHED_STORED16 = MEMCACHED_NOTFOUND17 = MEMCACHED_MEMORY_ALLOCATION_FAILURE18 = MEMCACHED_PARTIAL_READ19 = MEMCACHED_SOME_ERRORS20 = MEMCACHED_NO_SERVERS21 = MEMCACHED_END22 = MEMCACHED_DELETED23 = MEMCACHED_VALUE24 = MEMCACHED_STAT25 = MEMCACHED_ITEM26 = MEMCACHED_ERRNO27 = MEMCACHED_FAIL_UNIX_SOCKET // DEPRECATED28 = MEMCACHED_NOT_SUPPORTED29 = MEMCACHED_NO_KEY_PROVIDED /* Deprecated. Use MEMCACHED_BAD_KEY_PROVIDED! */30 = MEMCACHED_FETCH_NOTFINISHED31 = MEMCACHED_TIMEOUT32 = MEMCACHED_BUFFERED33 = MEMCACHED_BAD_KEY_PROVIDED34 = MEMCACHED_INVALID_HOST_PROTOCOL35 = MEMCACHED_SERVER_MARKED_DEAD36 = MEMCACHED_UNKNOWN_STAT_KEY37 = MEMCACHED_E2BIG38 = MEMCACHED_INVALID_ARGUMENTS39 = MEMCACHED_KEY_TOO_BIG40 = MEMCACHED_AUTH_PROBLEM41 = MEMCACHED_AUTH_FAILURE42 = MEMCACHED_AUTH_CONTINUE43 = MEMCACHED_PARSE_ERROR44 = MEMCACHED_PARSE_USER_ERROR45 = MEMCACHED_DEPRECATED46 = MEMCACHED_IN_PROGRESS47 = MEMCACHED_SERVER_TEMPORARILY_DISABLED48 = MEMCACHED_SERVER_MEMORY_ALLOCATION_FAILURE49 = MEMCACHED_MAXIMUM_RETURN /* Always add new error code before */11 = MEMCACHED_CONNECTION_SOCKET_CREATE_FAILURE = MEMCACHED_ERRORThe method correctly returns false if you set the value to false. This means that in order to have proper fault checking mechanism in place you need to check the result code.<?php$Memcached = new Memcached();$Memcached->addServer('localhost', 11211);$Memcached->set('key', false);var_dump($Memcached->get('key')); // boolean falsevar_dump($Memcached->getResultCode()); // int 0 which is Memcached::RES_SUCCESS ?>