What is HTML5?
HTML is Hypertext Markup Language, a front-end language, h5 is HTML5, which is used to write pages.
What is PHP?
PHP is a general open source scripting language and a backend development language used to process data and logic.
The relationship between HTML5 and PHP:
1. PHP MYSQL is the programming language and database system on the server side of the website.
2. CSS3 HTML5 is a website client-side style and hypertext markup language.
3. PHP MYSQL, CSS3 HTML5 and other scripting languages (javascript), website operating environment, etc. form a complete website.
Generally speaking, CSS3 HTML5 is responsible for the front-end display (that is, the web page we finally see), and PHP MYSQL is responsible for reading, analyzing, storing and other data. When developing a dynamic website, one of the two is missing. No.
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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。

H5是指HTML5,是HTML的最新版本,H5是一个功能强大的标记语言,为开发者提供了更多的选择和创造空间,它的出现推动了Web技术的发展,使得网页的交互和效果更加出色,随着H5技术的逐渐成熟和普及,相信它将会在互联网的世界中发挥越来越重要的作用。

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。

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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