What is PHP - A basic understanding of PHP_PHP tutorial

　php (as the current mainstream development language) is a server-side scripting language used to create dynamic web pages. You create pages through php(as the current mainstream development language) and HTML. When a visitor opens a web page, the server will process the php (as the current mainstream development language) command, and then send the processing result to the visitor's browser, just like ASP or ColdFusion Same. However, php(as the current mainstream development language) is different from ASP or ColdFusion in that it is cross-platform open source code. php(as the current mainstream development language) can be executed in Windows NT and many different Unix versions. It can also be compiled into an apache(the most popular WEB server platform on the Unix platform) module, or a cgi (not many people use it now) binary file. When compiled into apache(the most popular WEB server platform on the Unix platform) model, php(as the current mainstream development language) is especially lightweight and convenient. It doesn't have any of the burden of tedious programming, so results can be returned quickly, and there's no need to tweak mod_perl to keep the server's memory image small.
　
In addition to being used to generate the content of your web page, php(as the current mainstream development language) can also be used to transmit HTTP headers. You can set cookies, manage authorizations, and redirect users to new pages. It also has good access to many databases and ODBC. In addition, it can be integrated with a variety of external libraries, allowing you to do almost anything, from creating PDF files to parsing xml(standardization is getting closer).
　
　php(as the current mainstream development language) The code is embedded in the Web page, so you don't have to build a special development environment or IDE for it. You use (as the current mainstream development language) and end it with ?>mark php(as the current mainstream development language) code (you can also use php(As the current mainstream development language) is set to use the <% %> mark in ASP form or even used). The php(as the current mainstream development language) engine will handle anything between these flags.
　
　php(as the current mainstream development language)The syntax of the language is very similar to C and Perl. You don't need to declare variables before using them. Creating arrays and hashes (associative arrays) is also fast. The preliminary object-oriented features of php (as the current mainstream development language) also provide an easy way to organize and package code.
　
Although php(as the current mainstream development language) runs the fastest when embedded in apache(the most popular WEB server platform on the Unix platform), but On php(as the current mainstream development language) related sites, there are still information on how to make it seamlessly integrated with Microsoft iis(Microsoft's WEB server platform) and Netscape Enterprise Server Operation Guide. If you don’t have php(as the current mainstream development language), you can download it from its official website. There you can also find a user manual covering all functions and features of php(as the current mainstream development language).
　
　Create your own commands
Because php(as the current mainstream development language) scripts are written in HTML documents, you don’t have to use special editor to create pages. However, you must execute php(as the current mainstream development language) on a server that supports php(as the current mainstream development language). This is easy to do if you are using your own server. If the page is processed through an ISP service, you need to contact your ISP's customer service team and ask them to help you install php(as the current mainstream development language).
　
　For Unix systems, you must have basic Unix skills, such as using make and a C language compiler. On your system, you will also need an ANSI C compiler, and a Web server.
　
　For Windows 95/NT, you need one of the following servers: Microsoft Personal Web Server, Microsoft Internet Information Server 3 or 4, apache(the most popular WEB server platform on Unix platform) 1.3 .x, or Omni HTTPd 2.0b1.