php memcached methods are: 1. set(); 1. add(); 3. replace(); 4. get(); 5. delete(); 6. increment(); 7. decrement (); 8. flush(); 9. connect() and so on.
The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer
PHP operates Memcached Summary of methods
(1) memcache extension
1, bool Memcache::set ( string $key , mixed $var [, int $flag [, int $expire ]] )
#Update the value if the Key exists, and set the k-v pair if it does not exist. Note: $var can store any data
2, bool Memcache::add ( string $key , mixed $var [, int $flag [, int $expire ]] )
#Add only when key does not exist
3, bool Memcache: :replace ( string $key , mixed $var [, int $flag [, int $expire ]] )
#Replace the existing key value. If the key does not exist, an error will be returned.
4, string Memcache::get ( string $key [, int &$flags ] )
array Memcache::get ( array $keys [, array &$flags ] )
#Get one or more values
5, bool Memcache::delete ( string $key [, int $timeout = 0 ] )
#Delete the key element. If timeout is set, how many seconds will it take to delete it?
#[Note] Some versions corresponding to memcached using timeout will cause the deletion to fail. (0 is OK)
6, int Memcache::increment ( string $key [, int $value = 1 ] )
#If the key exists and can be converted to a number, add int; otherwise, directly replace it with value. When the key does not exist, return false
7, int Memcache::decrement ( string $key [, int $value = 1 ] )
8, bool Memcache::flush (void)
#All elements are invalid
9, bool Memcache::connect ( string $host [, int $port [, int $timeout=1 ]] )
#Connect to the memcache server , it will automatically close after executing the script (use close to actively close)
10, bool Memcache::close (void)
#Close the memcache link (this The function will not close the persistent connection)
11. mixed Memcache::pconnect ( string $host [, int $port [, int $timeout ]] )
#Establish a persistent connection
12, bool Memcache::addServer ( string $host [, int $port = 11211 [, bool $persistent [, int $weight [, int $timeout [, int $retry_interval [, bool $status [, callback $failure_callback [, int $timeoutms ]] ]]]]]] )
#Add a server to the connection pool. The service opened through this method will be closed or actively closed when the script ends. close
#Use this Method, the network connection does not necessarily connect immediately, but will not be connected until the server needs to be used, so there is no overhead even if a large number of servers are added to the connection pool
Parameters:
$persistent Whether to persist, the default is true
$weight Indicates the weight
$retry_interval The retry time when the server connection fails, the default is 15 seconds, -1 means no retry
$status Controls whether this server is marked as online (if The connection fails and one server is missing from the connection pool, which will affect the original allocation algorithm)
$failure_callback Function executed after the connection fails (executed before failover), including Two parameters, failed host host and port
13, array Memcache::getExtendedStats ([ string $type [, int $slabid [, int $limit = 100 ]]] )
#getExtendedStats() returns a two-dimensional associated data server statistics
#getExtendedStats(' slabs') to obtain the ID of the active slabs blocks on each server
#getExtendedStats('cachedump', $slabid, $limit) to obtain the cached items in each slab
Parameters:
#type The type of statistical information expected to be captured. The values that can be used are {reset, malloc, maps, cachedump, slabs, items, sizes}
#slabid Used with parameterstype Jointly copies data from the specified slab in blocks. The cachedump command will completely occupy the server and is usually used for strict debugging.
#limit is used in conjunction with the parameter type to set the number of entities obtained from the server during cachedump.
14, int Memcache::getServerStatus ( string $host [, int $port = 11211 ] )
#Return a The status of the server, 0 means the server is offline, non-0 means online.
15、array Memcache::getStats ([ string $type [, int $slabid [, int $limit = 100 ]]] )
#getStats()Returns a server statistics of associated data. Same as above
16, string Memcache::getVersion (void)
#Return version number
17, bool Memcache::setCompressThreshold (int $threshold [, float $min_savings ] )
#Enable automatic compression for large values
Parameters:
#threshold Controls the threshold value for automatic compression.
#min_saving Specifies the compression ratio of the actual stored value after compression. The supported value must be between 0 and 1. The default value is 0.2, which means 20% compression rate
18, bool Memcache::setServerParams ( string $host [, int $port = 11211 [, int $timeout [, int $retry_interval = false [, bool $status [, callback $failure_callback ]]] ]] )
# Used to modify server parameters during runtime
# Parameters are the same as above
##(2) memcached extension
1,Memcached::__construct ([ string $persistent_id ] )
persistent_id. All instances created with the same persistent_id value share the same connection.
<?php # 创建一个普通的对象 $m1 = new Memcached(); echo get_class($m); /* 创建持久化对象 */ $m2 = new Memcached('story_pool'); $m3 = new Memcached('story_pool'); # 现在$m2和$m3共享相同的连接 ，可以使用isPresistent进行检测 ?>
Memcached::addServer( string $host , int $port [, int $weight = 0 ] )
Memcached::addServers (array $servers)
Memcached::cas( float $cas_token ,
string $key , mixed $value [, int $expiration] )
value of the current client, this key
When the corresponding value has not been modified by other clients,
Only then can the value be written. Check through cas_token parameters
Memcached::casByKey (float $cas_token,
string $server_key, string $key, mixed $value [, int $expiration] )
Memcached::set( string $key, mixed $value [, int $expiration] )
Memcached::setByKey ( string $server_key, string $key , mixed $value [, int $expiration] )
Memcached::setMulti (array $items [, int $expiration ] )
Memcached::setMultiByKey ( string $server_key, array $items [, int $expiration] )
Memcached::add( string $key, mixed $value [, int $expiration] )
Memcached::addByKey( string $server_key, string $key , mixed $value [, int $expiration] )
Memcached::touch( string $key, int $expiration)
Memcached::touchByKey( string $server_key, string $key , int $expiration)
Memcached::append ( string $key , string $value )
value string value corresponding to the parameter to the existing element
注意：如果Memcached::OPT_COMPRESSION常量开启，这个操作会失败，并引发一个警告，因为向压缩数据后追加数据可能会导致解压不了。
<?php $a = new Memcached(); $a->addServer('192.168.95.11', 11211); #$a->addServer('192.168.95.11', 11210); #$a->setOption(Memcached::OPT_COMPRESSION, false); $b=$a->append('e','popop'); echo "<pre class="brush:php;toolbar:false">"; print_r($b); echo "";die; ?>
15、public bool Memcached::appendByKey ( string $server_key, string $key , string $value )
#向指定服务器已经存在的元素后追加value参数对应的字符串值
16、public bool Memcached::prepend( string $key , string $value )
#向一个已存在的元素前面追加数据
17、public bool Memcached::prependByKey( string $server_key, string $key , string $value )
#向指定服务器已经存在的元素前追加value参数对应的字符串值
18、public bool Memcached::replace ( string $key , mixed $value [, int $expiration] )
#替换已存在key下的元素
19、public bool Memcached::replaceByKey( string $server_key, string $key , mixed $value [, int $expiration] )
#替换指定服务器的key下的元素
20、public int Memcached::decrement ( string $key [, int $offset = 1 ] )
#减小数值元素的值
#不存在key返回错误、减到小于0结果为0、元素不是数值以0对待
21、public int Memcached::decrementByKey( string $server_key, string $key [, int $offset = 1 [, int $initial_value = 0 [, int $expiry = 0 ]]] )
#指定服务器减小数值元素的值，不存在的key则初始化为0
22、public int Memcached::increment ( string $key [, int $offset = 1 ] )
#增加数值元素的值
23、public int Memcached::incrementByKey( string $server_key, string $key [, int $offset = 1 [, int $initial_value = 0 [, int $expiry = 0 ]]] )
#同上
24、public bool Memcached::delete( string $key [, int $time = 0 ] )
#删除一个元素
#设置时间后，表明在time时间后才删除，在这段时间内get、add、replace命令对该key都无效。
25、public bool Memcached::deleteByKey ( string $server_key, string $key [, int $time = 0 ] )
#同上
26、public bool Memcached::deleteMulti ( array $keys [, int $time = 0 ] )
#删除多个key
27、public bool Memcached::deleteMultiByKey( string $server_key, array $keys [, int $time = 0 ] )
#同上
28、public bool Memcached::flush([ int $delay = 0 ] )
#让所有缓冲区的数据失效
29、public mixed Memcached::get( string $key [, callback $cache_cb [,
float &$cas_token ]] )
#检索一个元素
#$callback 回调函数，没有$key之值时，将会调用这个函数，会传入三个参数memcache对象、key、引用传递变量的返回值（true时返回）
#$cas_token 配合cas使用。同一个客户端最后一个get将会生成一个64位唯一标识符存储，然后使用cas来查看更改，假若在此过程中被其他客户端修改则，返回false
30、public mixed Memcached::getByKey( string $server_key, string $key [, callback $cache_cb [,
float &$cas_token ]] )
#从特定的服务器检索元素
31、public mixed Memcached::getMulti( array $keys [, array &$cas_tokens [, int $flags ]] )
#检索多个元素，提供$cas值，则添加cas值
#$flags 只能为Memcached::GET_PRESERVE_ORDER，保证返回的key的顺序和请求时一致。
32、public array Memcached::getMultiByKey ( string $server_key, array $keys [, string &$cas_tokens [, int $flags ]] )
#从特定服务器检索多个元素
33、public array Memcached::getAllKeys( void )
# Gets the keys stored on all the servers
34、public bool Memcached::getDelayed( array $keys [, bool $with_cas [,
callback $value_cb ]]
)
#Request keys from the server. This method does not wait for the response but returns bool immediately. Use fetch and fetchAll to collect the results.
#$with_cas When true, it means that the cas value is recorded at the same time
#$value_cb Result callback function processing
35, public bool Memcached::getDelayedByKey( string $server_key, array $keys [, bool $with_cas [,
callback $value_cb ]]
)
#Request multiple keys from the specified server
36, public array Memcached::fetch (void)
#From the last request to grab the next result.
37, public array Memcached::fetchAll(void)
#Fetch all remaining results
38, public mixed Memcached ::getOption( int $option )
#Get the Memcached option value
# One of the OPT_* series constants.
39, public bool Memcached::setOption( int $option , mixed $value )
#Set one memcached options
40, public bool Memcached::setOptions( array $options )
#Set multiple memcached options
41. public int Memcached::getResultCode(void)
#Returns the result code of the last operation
42. public string Memcached::getResultMessage( void )
#Return the result description message of the last operation
43, public array Memcached::getServerByKey( string $server_key )
#Get the server information mapped by key
44, public array Memcached::getServerList(void)
#Get the server in the server pool Table
45, public array Memcached::getStats (void)
#Get statistical information in the server pool
46, public array Memcached::getVersion( void )
#Get all server version information in the server pool
47, public bool Memcached::isPersistent( void )
#Test whether the server is permanently connected
48, public bool Memcached::isPristine (void)
#Test whether memcache is recently created
49, public bool Memcached::quit (void)
#Close the connection
50, public bool Memcached::resetServerList( void )
#Reset the server service information of all servers
51, public void Memcached::setSaslAuthData( string $username, string $password )
#Set the credentials to use for authentication
(The above are the notes I compiled while referring to the manual to learn memcached, and I will also post them by the way. Well, if there are any deficiencies or errors, please point them out)
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