The difference between php and .net: 1. .NET is Microsoft’s contemporary operating platform, while PHP is a cross-platform server-side embedded scripting language; 2. Compared to .net, php is more Interpreted language type; 3. In .net, the main operation objects are encapsulated class libraries, while in php, the main operation objects are various functions, etc.
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.NET is Microsoft's contemporary operating platform, which allows people to Various application methods are built on it to enable people to obtain information from websites in as simple a way as possible, to solve the collaborative work between websites, and to break down computers, equipment, websites, major institutions and industries. Barriers between industries - the so-called "digital islands", thereby realizing the full potential of the Internet and building a third-generation Internet platform. The suffix "net" is a network service company that provides services to individuals or businesses.
PHP is a cross-platform server-side embedded scripting language. It borrows a lot of syntax from C, Java and Perl languages, and couples PHP's own features to enable WEB developers to quickly write dynamically generated pages. It supports most current databases. Another point is that PHP is completely free. You don’t need to spend money. You can download it freely from the PHP official site (http://www.php.net). And you have unrestricted access to the source code, and you can even add the features you need.
The difference between asp.net and php is as follows:
Compared to .net, php is more inclined to the interpreted language type;
In .net, we operate The main thing is the encapsulated object-class library; in php, the objects we mainly operate are mainly various functions;
PHP programming tools are relatively different. net's programming environment and database are very, very lightweight; especially the programming environment, which is both lightweight and very flexible;
In .net and php, the methods of data transfer include get and post (Chapter Three types will not be discussed for now); in .net, we use context.Request["ID of the operation object"] and context.QueryString["ID of the operation object"] to obtain data; in php, we obtain data What is used is $_get["ID of the operation object"], $_post["ID of the operation object"];
In .net, the way to display data is Response.Write("What you want to display Content"); in php, we use echo "the content you want to display";
In .net we mainly operate objects and arrays, and the two can be converted into each other; in . In net, the objects we operate are mainly arrays.
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。


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