php caching technology is very commonly used and important in the development process. Caching technology can reduce server load, reduce network congestion, and enhance www.scalability. Its basic idea is to use the time locality of customer access to cache the data that customers have visited. A copy of the content is stored in the Cache. When the content is accessed next time, it does not have to be connected to the hosting website, but is provided by the copy retained in the Cache.
For this reason, our PHP Chinese website's Class Library Download summarizes various PHP cache class libraries for friends in need and newcomers to learn PHP to download for reference and study.
1. Simple php data file caching class library
Data file caching Commonly used methods include php file caching and using memcache to cache data. Below I have summarized memcache caching data and data file caching. Friends in need can refer to it.
1. For general variables, put the The variable becomes the format of the PHP language and is written to the file. When used, as long as the file is included, it is equivalent to loading the cache.
2. For array-type variables, convert the array into the characters that define the array in the PHP language. String, written to the file, it only takes include to load the cache.
3. To control the cache time, compare the creation time of the cache file with the current time. If there is no When the update time comes, read the cache directly. If the update time comes, query the database.
See the code for setting details. This version is utf-8 encoded. If the website uses other encodings, please convert it yourself. For Windows systems, use Notepad to open Save As and select the corresponding encoding (generally ANSI). Under Linux, please use the corresponding editing software. or iconv command line. The fundamental difference between dynamic caching and static caching is that it is automatic. The process of user accessing the page is the process of generating cache, browsing cache, and updating cache, without manual intervention.
3. Simple and practical PHP cache library
Describes a simple and practical PHP cache Class, which can be used to check whether cache files are within the set update time, clear cache files, generate cache file names based on current dynamic files, continuously create directories, output static cache files, etc. For the development of CMS systems using PHP, it is inseparable from the processing of cache. Proper use of cache can effectively improve program execution efficiency.
4. php cache file class extracted from CI
From stblog of CI community and file_helper of CI The PHP file cache class extracted from the class, a simple file-based key->value cache class. This class can be used to cache some basic information, such as some infrequent changes in the header, footer, and sidebar of the blog, and the content taken out from the database. Before fetching the data, first determine whether the content in the file cache has expired. If it has not expired, take it out. , if it expires, connect to the database to query, rewrite the results into the file cache, and update the expiration time.
shared is taken from The file caching code in ThinkPHP is very practical and very efficient. It is recommended to everyone. For reference, friends in need can set up the file cache, obtain files, and delete files.
6. php memory cache memcached class code
Construction method, used to add a server and create a memcahced object to obtain memcached Object, check whether the mem connection is successful, add data to memcache, obtain the data saved in memcahce, and delete all caches related to the same table.
If the traffic is large This will put a huge burden on the database, so it is very necessary to have a good PHP data cache (cache) for content that changes infrequently. For general variables, change the variable into the PHP language format and write it to the file. When you include the file, it is equivalent to loading the cache; For array-type variables, write array Convert it into a string that defines the array in PHP language and write it to the file. It only takes as long as include, which is equivalent to loading the cache.
Cache file path, including file name, destructor, check whether the cache directory is Valid, default assignment, check whether the cache is valid, terminate the execution of the original page program after loading the cache, if the cache is invalid, run the original page program to generate a cache, enable the browser cache to obtain the page content at the end of the page.
9. php cache class suitable for large websites
This cache class is very reasonable from all aspects And it is suitable for large websites. The cache time is greater than 0. Detect the modification time of cached files. Within the cache time, it is the cache file name. If it exceeds the cache time, it is False. Compare the time difference between the creation/modification date of the file and the current date.
10. PHP cache multi-level directory class
The parameters are detailed as follows:
First parameter: Cache secondary directory
Second parameter: Cache time Default 1800
Third parameter: Whether a third-level directory is required 0: Not required 1 Required Default 0
Fourth parameter : Cache suffix Default.html
Calling method:
$cache = new php_cache('index');
$cache = new php_cache('index',1800) ;
$cache = new php_cache('index',1800,1);
$cache = new php_cache('index',1800,1,'.html');
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