PHP Advantages and Trends
High security: open source, compiled with apache for more flexible security settings . Php has proven security properties.
Cross-platform: PHP supports almost all operating systems (win32 unix linux macintosh os2, etc.), and supports a variety of WEB servers such as apache and IIS, which is widely spread. (Recommended learning: PHP video tutorial)
Supports a wide range of databases: can operate a variety of mainstream and non-mainstream databases, such as MYSQL, access, SQL server, oracle, DB2, etc., among which PHP It is currently the best combination with MYSQL, and their combination can run across platforms.
Easy to learn: PHP can be embedded into HTML. It is mainly a scripting language. It has rich built-in functions and simple syntax. It is a weakly typed language and is easy to learn.
Fast execution speed: takes up less resources and is fast.
Free and open source: LAMP combinations are usually used in enterprises, all are open source, which saves money economically and has a lot of network materials.
Template: realize the separation of program logic and user interface.
Support object-oriented: Both object-oriented and process-oriented are supported.
Built-in zend acceleration engine, stable and fast performance.
The PHP language is simple, easy to learn, object-oriented and safe and has been recognized by more and more people. Its development prospects are impressive. Its LAMP classic combination has become an excellent framework for website construction today.
I believe that the new PHP language will move in a more enterprise-oriented direction and will be more suitable for the development of large systems. PHP will definitely show a good development trend in the future with its powerful functions.
PHP application fields
Development of small and medium-sized websites;
Display of business logic results of large websites;
WEB office management System;
GUI of hardware management and control software;
E-commerce application;
Web application system development;
Multimedia system development;
Enterprise application development.
PHP is attracting more and more WEB developers. PHP brings numerous benefits to businesses and users.
According to statistics, there are more than 22 million websites and 15,000 companies around the world using PHP language, including famous websites such as Baidu, Yahoo, Google, YouTube, Digg, and Lufthansa Avionics Booking systems, Deutsche Bank's online banking, Wall Street Online's financial information publishing system, etc., and even harsh environments such as military systems also choose to use PHP language.
PHP is also the language used by enterprises to build a new generation of comprehensive business that is service-oriented, creates and mixes WEB, and has become the development direction of open source business applications.
The above is the detailed content of What fields is php used in?. For more information, please follow other related articles on the PHP Chinese website!

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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