b/s: web program based on browser and server architecture
c/s: QQ SVN client + server
Simple text line-based protocol:
redis
memcache
Difference:
both store data, memcache saves it directly to the memory, redis saves it to the memory, and saves it to the hard disk after closing. Memcache restarts the computer , shutting down the service will cause data loss
(1) Save it in the memory
(2) Restart the computer, restart the service and all data will disappear
(3) LRU algorithm, based on the recently used variables, will store the data for a long time Delete unused variables
How PHP operates memcache
1. PHP loads the extension php_memcache.dll extension
Serialization
Deserialization
memcache can be saved Data: string, numeric value, array, object
When we get the object saved in memcache, we need to provide the definition of this class, otherwise, it will prompt that we don’t know which class of object it is
memcahe and redis: redis You can also save hash, data structure
2, memcached client operation
C/S connects to the server through the client
Add php_memcache.dll, but we don’t have it Permission to modify php configuration file
But you still want to use memory memcache
You can also use client operation
Through socket technology,
mysql query
Sort the query in English
Chinese --- --sphinx Chinese search engine
Close memcache extension
Use socket technology to complete PHP's CRUD operation on memcache
DLL-encapsulated function class library, through which memory space can be opened and data can be saved
Is it possible? Is the function written by myself the same as the function encapsulated by dll?
The idea is to convert the class library developed in C language in dll into PHP language
A lively Lei Feng in the Internet world shared the PHP class file
If there is a notice level error, modify it php error_reporting + E_ALL+NOTICE
Memcache life cycle:
Restarting memcached and restarting the operating system will cause all data to disappear. In addition, after the content capacity reaches the specified value, unused caches are automatically deleted based on the LRU (Least Recently Used) algorithm.
If expire is set to 0, it means it will never expire until the machine is restarted or the service is restarted
There is no need to blame it if you want to.
Save the session data to memcache
The session data is by default , saved in the file file
, but we can modify the php configuration to save it elsewhere
1, let memcache handle the session
2,
but How to get the session variable, it is no longer the name attribute, but saved through session_id
session_id
When the browser accesses the server, the server assigns the session_id to the browser and then finds the corresponding value through session_id
If sessaion saves objects, the tired information will be lost when obtained
But there are still questions:
What if you don’t have permission to modify the php configuration?
ini_set() can set some php configurations in the php file
Security issue:
Now anyone can access my memcache
Solution:
Firewall

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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