The official homepage of memcache: http://pecl.php.net/package/memcache
The official homepage of memcached: http://pecl.php.net/package/memcached
The following is how I installed Memcached Version of the process record of the PHP module:
wget http://download.tangent.org/libmemcached-0.48.tar.gz
tar zxf libmemcached-0.48.tar.gz
cd libmemcached- 0.48
./configure --prefix=/usr/local/libmemcached --with-memcached
make
make install
wget http://pecl.php.net/get/ memcached-1.0.2.tgz
tar zxf memcached-1.0.2.tgz
cd memcached-1.0.2
/usr/local/webserver/php/bin/phpize
./configure - -enable-memcached --with-php-config=/usr/local/webserver/php/bin/php-config --with-libmemcached-dir=/usr/local/libmemcached
make
make install
Add
extension=memcached.so to php.ini
Complete
Another:
When installing libmemcached, if you only use ./configure, you may be prompted:
checking for memcached… no
configure: error: “could not find memcached binary”
The two are almost identical in use.
$mem = new Memcache;
$mem->addServer($memcachehost , '11211');
$mem->addServer($memcachehost, '11212');
$mem->set('hx','9enjoy');
echo $mem- >get('hx');
$md = new Memcached;
$servers = array(
array($memcachehost, '11211'),
array($memcachehost, '11212')
);
$md->addServers ($servers);
$md->set('hx','9enjoy');
echo $md->get('hx');
memcached There are many more methods than memcache, such as getMulti, getByKey, addServers, etc.
Memcached does not have the connect method of memcache, and it does not currently support long connections.
Memcached supports Binary Protocol, but memcache does not, which means memcached will have higher performance.
Memcache is implemented natively and supports the coexistence of OO and non-OO interfaces. memcached uses libmemcached and only supports OO interfaces.
More detailed differences: http://code.google.com/p/memcached/wiki/PHPClientComparison
The memcached server is a centralized caching system, and the distributed implementation method is Determined by the client.
The memcached distribution algorithm generally has two options:
1. According to the result of hash(key), the remainder of the modular connection number determines which node to store, that is, hash(key)% sessions.size(), This algorithm is simple, fast and performs well. However, this algorithm has a shortcoming, that is, when memcached nodes are added or deleted, the original cached data will become invalid on a large scale, and the hit rate will be greatly affected. If there are many nodes and cached data, the cost of rebuilding the cache will be too high, so With the second algorithm.
2. Consistent Hashing, consistent hashing algorithm, its node search process is as follows:
First find the hash value of the memcached server (node), and configure it to the circle (continuum) of 0~232 superior. Then use the same method to find the hash value of the key storing the data and map it to the circle. It then searches clockwise starting from the location where the data is mapped, and saves the data to the first server found. If the server is still not found after exceeding 2 to the power of 32, it will be saved to the first memcached server.
memcache uses the first method without any configuration. To implement the first method, memcached seems to use (unconfirmed):
$md->setOption(Memcached::OPT_HASH, Memcached::HASH_CRC);
The second consistent hash Algorithm:
memcache Add
Memcache.hash_strategy =consistent
Memcache.hash_function =crc32
Add memcached in the program (unconfirmed)
$md->setOption(Memcached::OPT_DISTRIBUTION, Memcached::DISTRIBUTION_CONSISTENT);
$md->setOption(Memcached::OPT_HASH, Memcached::HASH_CRC);
or
$mem->setOption(Memcached::OPT_DISTRIBUTION,Memcached::DISTRIBUTION_CONSISTENT);
$mem->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE,true);
Some reference documents:
memcached distribution test report (hash function selection in the case of consistent hashing):
http://www.iteye.com/topic/346682
php module memcache The difference with memcached: http://www.jb51.net/article/27366.htm
PHP module: Memcached > Memcache: http://www.jb51.net/article/27367.htm
20110509@@UPDATE:
If you install libmemcached, the following error message appears:
make[2]: *** [clients/ms_conn.o] Error 1
make[2]: Leaving directory `/www /soft/libmemcached-0.48'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/www/soft/libmemcached-0.48'
make: *** [all] Error 2
You can add --disable-64bit CFLAGS="-O3 -march=i686" when configure.
That is: ./configure --prefix=/usr/local /libmemcached --with-memcached --disable-64bit CFLAGS="-O3 -march=i686"

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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