Big data solution
Use cache: (Recommended learning: PHP video tutorial )
How to use: 1. Use the program to save directly into the memory. Mainly use Map, especially ConcurrentHashMap.
Use caching framework. Commonly used frameworks: Ehcache, Memcache, Redis, etc.
The most critical question is: when to create the cache and its invalidation mechanism.
For the buffering of empty data: It is best to save it with a specific type value to distinguish between empty data and uncached states.
Distributed database
Store different tables in different databases, and then put them on different servers. Some complex problems, such as transaction processing and multi-table query.
NoSql and Hadoop
NoSql, not only SQL. It does not have as many restrictions as relational databases and is more flexible and efficient.
Hadoop layers the data in a table into multiple blocks and saves it to multiple nodes (distributed). Each piece of data is stored on multiple nodes (cluster). Clusters can process the same data in parallel and ensure data integrity.
High concurrency solution
Separate applications and static resources.
Put static resources (js, css, pictures, etc.) into a dedicated server.
Page caching
Cache the pages generated by the application to save a lot of CPU resources.
For some pages that frequently change data, you can use ajax to process it.
Cluster and distributed
Cluster, multiple servers have the same functions and mainly play the role of diversion.
Distributed, putting different businesses on different servers. Multiple servers may be needed to process a request, thereby increasing the processing speed of a request.
It is divided into static resource cluster and application cluster. The latter is more complicated, and issues such as session synchronization often need to be considered.
Reverse proxy
The server that the client directly accesses is not the server that directly provides services. It obtains resources from other servers and then returns the results to the user.
CDN
CDN is a special cluster page cache server. Compared with multiple page cache servers in an ordinary cluster, the main difference is: its storage location and Allocate requests differently.
CDN servers are distributed across the country. After receiving a request, it will be assigned to the most appropriate CDN server node to obtain the data. Each of its CDN nodes is a page caching server.
The above is the detailed content of How to handle high concurrency of big data in PHP. For more information, please follow other related articles on the PHP Chinese website!

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。

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)”。

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。


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