


Summary of various methods of PHP caching technology, summary of PHP caching_PHP tutorial
A summary of various methods of PHP caching technology, a summary of PHP caching
The data caching mentioned here refers to the database query PHP caching mechanism. Every time a page is accessed, the corresponding Whether the cached data exists. If not, connect to the database, obtain the data, and serialize the query results and save them to the file. In the future, the same query results will be obtained directly from the cache table or file. 1. Universal caching technology:Data cache: The data cache mentioned here refers to the database query PHP cache mechanism. Every time a page is accessed, it will first detect whether the corresponding cached data is Exists. If it does not exist, connect to the database, obtain the data, and serialize the query results and save them to the file. In the future, the same query results will be obtained directly from the cache table or file.
The most widely used example is the search function of Discuz, which caches the result ID into a table and searches the cache table first when searching for the same keyword next time.
As a common method, when multiple tables are associated, the contents in the attached table are generated and saved into an array in a field of the main table. When needed, the array is decomposed. The advantage of this is that only one table can be read. , the disadvantage is that there will be many more steps to synchronize the two data. The database is always the bottleneck. Trading the hard disk for speed is the key point of this.
2. Page cache:
Every time you access a page, it will first check whether the corresponding cached page file exists. If it does not exist, connect to the database and get Data, display the page and generate a cache page file at the same time, so that the page file will be effective the next time you visit. (Template engines and some common PHP caching mechanism classes on the Internet usually have this function)
3. Time-triggered caching:
Check whether the file exists and the timestamp is less than the setting The expiration time, if the file modification timestamp is greater than the current timestamp minus the expiration timestamp, then use the cache, otherwise update the cache.
4. Content-triggered caching:
When data is inserted or updated, the PHP cache mechanism is forced to be updated.
5. Static cache:
The static cache mentioned here refers to static, directly generating text files such as HTML or XML, and regenerating them when there are updates. , suitable for pages that don’t change much, so I won’t talk about it here.
The above content is a code-level solution. The following content is a server-side caching solution. It is not code-level and requires the cooperation of multiple parties.
6 , Memory cache:
Memcached is a high-performance, distributed memory object PHP caching mechanism system, used to reduce database load and improve access speed in dynamic applications.
7. PHP buffer:
There are eaccelerator, apc, phpa, xcache. I won’t talk about this one. Search a bunch of them yourself. Look, it’s OK to know that this thing exists
8. MYSQL cache:
This is also considered non-code level. Classic databases use this method. Look at the running time below, 0.09xxx and the like
9. Web cache based on reverse proxy:
Such as Nginx, SQUID, mod_proxy (apache2 and above are divided into For mod_proxy and mod_cache)
10. DNS polling:
BIND is an open source DNS server software. This is a big deal to mention. Search it yourself. Go ahead, just let everyone know that this thing exists.
I know that some large websites such as chinacache do this. To put it simply, it is multi-server. The same page or file is cached on different servers and automatically parsed to the relevant server according to the north and south.

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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