As PHP developers, we are used to worrying about sockets. "PHP scripts should be dead soon", some people will say so, but there are other different voices "then why don't you use Node to achieve this?"
The problem is, these opinions will make the development of PHP kernel and Attempts at surrounding ecosystems have stalled.
Don’t get me wrong: PHP was not built to use an event loop, and PHP was not built for asynchronous development. Any attempt to achieve this kind of thing defeats the purpose of PHP as a language. However, many people believe that PHP can change to suit these tasks.
For beginners, there is ReadPHP. This is a set of libraries that rely on extensions and some core functions to simulate event loops. There are other things reactive, like allowing and partially functional programs, but the focus is on reactive programming and event loops.
Then there’s Hack, a superset of PHP (developed by Facebook) designed to provide static typing. In addition, Hack also provides an asynchronous language architecture. Let's not forget that Facebook is writing the PHP language specification. They are developing HHVM, the first major competitor to the traditional PHP interpreter. They can shape new versions of PHP core without pushing code to PHP core.
Finally, modern PHP supports many asynchronous functions and extensions. It may not have started with an event loop, but there are signs that PHP is kind of moving in an asynchronous direction.
I’m excited about the advent of asynchronous PHP because I’ve talked about it and done development work on it. What I want to achieve is to enable every PHP developer to explore the concepts and tools of asynchronous programming. Realize that this is within our control, and that we can face PHP's past and performance without shame.
PHP may not be the best tool for the job, but if we don’t explore asynchronous PHP, it will never become the best tool for the job.

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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DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
