Today, I used to be an ASP.NET believer. Later, through the application of high-traffic websites, my experience tells me that Microsoft targets most of the middle and low-end people because its series of products are bloated. , but intelligently, such as SQL Server, IIS, and other bundled services, as well as the ASP.NET runtime library, the page must perform too many initialization operations, making the page slow and occupying too much memory.
Today I plan to examine the performance bottom line and operating mechanism of PHP, hoping for a good result!
The PHP core is executed in the middle of Opcode run by the Zend Engine component, just like the Framework runtime of .NET. But there is a big difference. Zend Engine is a virtual machine. It interprets and executes Opcode, that is, it reads and executes each sentence, similar to ASP. But because OpCode is binary, has standard syntax and is byte-based, the reading performance is very fast, much faster than ASP. .NET is said to be converted into computer language and then directly called and run. It is said that .net will be faster, but in fact, .NET plus some bloated class libraries and unknown compilation process, the speed cannot keep up with the interpretation and execution of PHP.
Thinking from the perspective of enterprise needs, too high performance is not the first requirement. The program must be simple to reduce development costs, and the performance can meet the needs. PHP's solution for large websites can meet their needs, because it is simple, sophisticated, and although its performance is not the best, its performance consumption can be supported by ordinary businesses. Most importantly, it consumes It's just a little bit and you can ignore it, but asp.net is different. No matter how big the problem is, you can still use a cluster solution to solve it.
PHP supports FPM process management mode, which allows for good processing performance when dealing with large traffic and large memory requirements.
Support fastcgi, which can be better compatible with the interfaces of various high-performance servers, and even Linux runs very well!
Overall evaluation, PHP is still more suitable for the application of portal websites and high-traffic sites.

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。

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。

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。

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。

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。


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