简介

CHDB (constant hash database) is a fast key-value database for constant data, realized by using a memory-mapped file and thus providing the following functionalities:

Extremely fast initial load, regardless of the size of the database.
Only the pages of the file which are actually used are loaded from the disk.
Once a page is loaded it is shared across multiple processes.
Loaded pages are cached across multiple requests and even process recycling.

A typical use of CHDB is as a faster alternative to defining many PHP constants.

CHDB is internally implemented as a hash-table using a » perfect hashing function, thus guaranteeing worst case O(1) lookup time.

php chdb 预定义常量 php chdb creates a chdb instance php chdb 范例 php chdb gets the value associated with a key php chdb 安装／配置 php chdb the chdb class php sequence updates all values by applying a callback function to each value php sequence reverses the sequence in place php set returns a shallow copy of the set php chdb 函数 creates a chdb file php pspell 函数 add the word to the wordlist in the current session php pspell 函数 store a replacement pair for a word php paradox 函数 returns number of fields in a database php chdb 简介 php mongodb driver monitoring commandsucceededevent returns the command name php mongodb driver exception runtimeexception returns whether an error label is associated with an exception php mongodb driver server checks if this server is a passive member of a replica set php chdb chdb 函数 php 用户空间命名指南全局命名空间 php v8jsexception the getjslinenumber purpose