What are the common caching techniques in PHP
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In the process of development, JBLOG has done a lot of work on performance optimization. In order to minimize unnecessary database queries, I cached and statically processed some data.
How caching works: store some frequently used but rarely changed data in an array or other form in a separate PHP file and include it when needed.
The advantage of cache: it can greatly reduce the query times of the database, reduce the pressure on the database, and improve the execution efficiency of the program.
The data cached by JBLOG are: system settings, blog classification, sidebar latest logs, latest comments, blog statistics, log archives, links, tags and so on. By caching this data, the number of queries to a page database is reduced from more than a dozen to three.
Cache-related functions in JBLOG are stored in cache.func.php in the include directory. The main functions are:
/ / refresh cache function recache ($cachestr =') {if (! $cachestr) {$cachelist = array ('config','class','archive','newcomment','newpost','link','tag','statistic','topblog');} else {$cachelist = explode (',', $cachestr); foreach ($cachelist as $cache) {$cachename = $cache.'_recache'; if (function_exists ($cachename)) {$cachename ();}
The recache () function is used to refresh the cache. Each cache exists as a separate function, and the corresponding function needs to be executed only once when the cache is refreshed.
/ / write the string to the file function writeToFile ($cachename,$content =') {$allowcache = $cachelist = array ('config','class','archive','newcomment','newpost','link','tag','statistic','topblog'); if (in_array ($cachename,$allowcache)) {$cache_dir = JBLOG_ROOT.'cache_data/'; $cache_file_name = $cache_dir.'cache_'.$cachename.'.php' If (! is_dir ($cache_dir)) {@ mkdir ($cache_dir,0777)} if ($fp = @ fopen ($cache_file_name,'wb')) {$content = "
