安装服务端
memcache是项目名,而在服务端的驻留进程叫memcached(linux的守护进程一般都是在后面加个d)。在OSX下使用brew可以快速安装memcache:
$ sudo brew install memcached
memcache的依赖:openssl和libevent会自动下载并安装。
安装完成后,使用如下命令启动:
$ sudo memcached -m 32 -p 11211 -d
安装php扩展
使用php操作memcache前,需要安装php的扩展,php的扩展有两个可以选择memcache和memcached,这里就安装比较经典的前者。从这里选择一个版本下载源码压缩包,解压,进入到源码目录后执行:
$ sudo phpize
phpize是帮助用来在已编译好的php外,编译php扩展用的脚本,用来生成configure、make等文件。有时执行这个命令会报错:
Cannot find autoconf. Please check your autoconf installation and the $PHP_AUTOCONF environment variable. Then, rerun this script.
缺少依赖,那就安装咯,还是使用brew:
$ sudo brew install autoconf
phpize完成后,依次实行如下命令实现编译和安装:
$ sudo ./configure $ sudo make $ sudo make install
编译好的memcache.so一般被安装到如下目录:
Installing shared extensions: /usr/lib/php/extensions/no-debug-non-zts-xxxxxx/
这样就可以在php.ini中配置这个扩展了:
extension=/usr/lib/php/extensions/no-debug-non-zts-xxxxxx/memcache.so
打开phpinfo()页面,查看memcache是否已经加载成功:
设置yii
这样其实已经可以在php中直接使用memcache了,这里就不累述了,如果在yii中使用,则需要添加一个组件:
'components'=>array( 'cache'=>array( 'class'=>'CMemCache', 'servers'=>array( array( 'host'=>'127.0.0.1', 'port'=>11211 ) ), ), ...
关于更多的yii配置请参阅其文档。最后,在yii中使用memcache:
Yii::app()->cache->set('key1','value1'); Yii::app()->cache->get('key1');
memcached使用示例
将纯粹使用数据库查询的代码加上memcached支持是很简单的,假设这是原来的代码:
function get_foo (int userid) { result = db_select("SELECT * FROM users WHERE userid = ?", userid); return result; }
加上memcached的缓存机制后:
function get_foo (int userid) { result = memcached_fetch("userrow:" + userid); if (!result) { result = db_select("SELECT * FROM users WHERE userid = ?", userid); memcached_add("userrow:" + userid, result); } return result; }
上述的程序会先到memcached检查是否有userrow:userid的数据,如果有则直接传回结果,如果不存在时再去数据库查询,并将结果放到memcached内。
在memcached内已经有缓存信息时将数据库的数据更新后,上述的程序会抓到旧的数据,这是属于Cache coherency的问题。其中一种解决的方法是在更新数据库时,同时更新memcached内的信息:
function update_foo(int userid, string dbUpdateString) { result = db_execute(dbUpdateString); if (result) { data = createUserDataFromDBString(dbUpdateString); memcached_set("userrow:"+userid, data); } }

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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