Let’s take a look at the specific data pictures first:
Let’s analyze:
I I read a lot of people’s answers!
Answer 1:
In fact, it’s not that Python is slow, but that PHP is too fast. Just like you can’t say that Kobe is worse, it’s just that Jordan is too good.
Answer 2:
C and Python are faster than C of course. Most of the PHP functions used in this test are provided by the language itself, and these functions are written in C. Python On the contrary, most functions are written in Python. This test only proves that PHP is faster than Python for this feature. It cannot explain the speed of the language itself. If you want to prove the speed of the language itself, the test code should run in the code of this language most of the time.
Answer 3:
It is faster to adjust C in Python. You need to use a high-performance place to independently make C modules. In contrast, nodejs can only use tcp, stdio and other methods to communicate with the c of another process. (If there are other methods, please point out the performance, whether to use c or not, there is a big difference.
PHP and Python (CPython) currently do not have JIT, so PHP can only win. The performance of the underlying VM is better than that of Python.
In fact, the official PHP language development team has been optimizing the performance of the VM since the 5.4 era. The PHP7 version has greatly transformed the underlying data structure, which is improved compared to 5.6 More than 1 times the performance. Compared with Python 2, Python 3 is regressing in performance.
In intensive computing scenarios, static languages and dynamic languages with JIT will have great advantages. You can see that Node The test results of .js (based on V8 engine) far exceed those of PHP and Python. The calculation instructions of the former are directly executed as CPU instructions, while the calculations of the latter are actually high-level instructions on the VM, and the implementation principles are very different.
However, PHPers, don’t be discouraged. The official PHP development team is already developing JIT features. Maybe the next version of PHP will carry JIT, which will be on the same order of magnitude as Node.js in intensive computing scenarios.
In addition, PHP, Python, and Node.js are all used to write application software, and the computing performance of the language is not that important. If your program is sensitive to performance, C /C /GO/Rust These static programming languages are the best choice.

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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