search
HomeBackend DevelopmentPHP TutorialWhat does php lack compared to C/C++ or Java? Multithreading, multithreading, multithreading…

I was chatting with a former colleague yesterday and complained about PHP and Swoole. He believed that PHP was full of pitfalls and that PHP had great limitations. PHP+Swoole is not suitable for high-concurrency servers, C+Swoole is the best solution. C++ has various data structures, C++ can open threads, and C++ can share objects. It seems necessary to explain it carefully.

What does HP lack compared to C/C++ or Java? Multi-threading, multi-threading, multi-threading...

Yes. PHP has fewer threads than C/C++ and Java. PHP only has a multi-process solution, so global variables and objects in PHP are not shared, data structures cannot be operated across processes, Socket file descriptors cannot be shared, etc. So PHP has limitations?

Multi-threading seems to be much more powerful than multi-processing. In fact, I can responsibly tell you that multi-threading brings more pitfalls.

Data synchronization issues will crash you. Either sacrifice performance and add locks everywhere, or use hell-hard lock-free concurrent programming. As far as I know, there are very few people in China who can master this skill.

Don’t think that everything will be fine if you add a lock. You will be in trouble with the deadlock problem. When your program logic becomes complex, locks become increasingly difficult to control. Once deadlocked, your program is basically doomed.

If a thread hangs, all threads will exit

Instead, we are looking at multiple processes, which is actually much simpler.

With inter-process communication, you can basically achieve any data sharing. For example, a process is used to specifically store data structures and objects, and all data operations of other processes are delivered to this process

Multiple processes do not require locks

Multiple processes can use shared memory data structures to implement some multi-threading functions. For example, Table and Atomic provided by Swoole can realize data sharing, but the cost is very low. Shared memory queues will be added in the future

The so-called PHP restricts Swoole is completely nonsense. Proper use of Table, Atomic, SendMessage/PipeMessage, and Task provided by Swoole can completely implement asynchronous and non-blocking code logic.

Do programs written in C++ have better performance?

This is completely blind superstition. C++ does have advantages for computationally intensive programs. The core of the concurrent server is IO, not large-scale intensive computing. C++ has no advantages from a language perspective. In addition, most data structures in C++ have corresponding implementations in PHP. If it is not possible, you can still solve it by writing a special extension yourself.

The high-concurrency server can maintain 10W connections per machine and can handle 3-5W messages sent and received per second. This level of performance can already be applied to BAT's core system.

What does it mean to have fast development efficiency?

This colleague also said that although PHP server development is faster than C++, C++ is still needed to pursue the ultimate performance. I'm going to tell you what it means to be efficient. Developing a good program is not an easy task and requires programmers to invest a lot of time and energy. The significance of improving development efficiency is not simply that I can complete the work in less time, but that in the remaining time you can add unit tests, fix bugs, improve user experience, improve details, provide supporting tools, optimize performance, add key logs, and increase Monitor alarms and add disaster recovery plans.


Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

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”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

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怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

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。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

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。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

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。

php怎么读取字符串后几个字符php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

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

php怎么查找字符串是第几位php怎么查找字符串是第几位Apr 22, 2022 pm 06:48 PM

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Tools

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!