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This article is about a brief introduction to the basics of the php language. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

PHP is a server-side scripting language that is easy to learn and use. With little programming knowledge, you can use PHP to build a truly interactive WEB site. This tutorial does not want you to fully understand the language, but will enable you to join the development of dynamic web sites as soon as possible. I assume you have some basic knowledge of HTML (or HTML editor) and some programming ideas.

1. Brief introduction

PHP is one of the tools that allows you to generate dynamic web pages. PHP web page files are treated as normal HTML web page files and you can write PHP in the same way as editing HTML.

PHP stands for: hypertext preprocessor (PHP: Hypertext Preprocessor).

PHP is completely free of charge, and you can download it freely from the official PHP website (http://www.php.net)). PHP complies with the GNU Public license (GPL), under which many popular software such as Linux and Emacs are born. You can get the source code without restrictions, and even add the features you need from it. PHP runs on most Unix platforms, GUN/Linux and Microsoft Windows platforms. Information on how to install PHP on a PC machine or a Unix machine in a Windows environment can be found on the official PHP site. The installation process is simple.

If your machine solves the 2000 problem, then PHP also has no Y2K problem!

(1) History

Three years ago, Rasmus Lerdorf created the "personal homepage tool" (Personal Home Page Tools) to create his online resume. This is a very simple language. Since then, more and more people have paid attention to the language and put forward various suggestions for its expansion. Thanks to the selfless dedication of many people and the free nature of the source code of the language itself, it has evolved into a feature-rich language and is still growing.

Although PHP is easy to learn, it is slower than mod_perl (the perl module embedded in the web server). Now there is a new engine called Zend that can match the speed of mod_perl, and PHP4 can make the most of it. PHP4 is still in the BETA testing phase. Andy Gutmans and Zeev Suraki are the lead authors of Zend.

The application of PHP has increased significantly in personal web projects. According to Netcraft's report in October 1999, there are 931122 domains and 321128 IP addresses using PHP technology.

(2) the advantages of PHP

There are many advantages to applying PHP. The known disadvantage, of course, is that PHP has little commercial support because it is an open source project, and the resulting slow implementation (until before PHP4). But PHP's mailing list is useful and unless you're running something like Yahoo! Or a hugely popular site like Amazon.com, you won't feel that the speed of PHP is any different from other sites. At least I didn't feel it! All right, let's take a look at the advantages of PHP:

Learning process

Personally, I prefer PHP's very simple learning process. Unlike Java and Perl, you don't have to bury your head in a document of more than 100 pages to study hard to write a decent program. As long as you know some basic grammar and language features, you can start your journey of PHP coding. After that, if you encounter any trouble in the coding process, you can go through the relevant documents again.

The syntax of PHP is similar to that of CMagi Perl Magi ASP or JSP. For those who are familiar with one of the above languages, PHP is too simple. On the contrary, if you know more about PHP, it will be easy for you to learn several other languages.

It only takes you 30 minutes to master all the core language features of PHP, and you may already know a lot about HTML, or even know how to use editing and design software or hand-made WEB sites. Because PHP code can be easily added to your site, you can easily add PHP to make your site more dynamic while you design and maintain the site.

Database connection

PHP can be compiled into functions that are connected to many databases. PHP and MySQL are now the combination of *. You can also write your own peripheral functions to access the database indirectly. In this way, when you change the database you use, you can easily change the code to adapt to such changes. PHPLIB is the most commonly used set of base libraries that can provide general service needs.

Expandability

As mentioned earlier, PHP has entered a period of rapid development. It may be difficult for a non-programmer to add functionality to a PHP extension, but it is not difficult for a PHP programmer.

Object oriented programming

PHP provides classes and objects. The programming based on web needs the ability of object-oriented programming. PHP supports constructors, extraction classes, and so on.

Scalability

Traditionally, the interaction of web pages is realized through CGI. The scalability of the CGI program is not ideal because it opens a separate process for each running CGI program. The solution is to compile the interpreter of the language often used to write CGI programs into your web server (such as mod_perl,JSP). PHP can be installed in this way, although few people would like to install it as CGI. Embedded PHP can be more scalable.

More features

In order to be more suitable for web programming, PHP developers have developed a number of peripheral popular base libraries that contain easier-to-use layers. You can use PHP to connect to most databases, including Oracle,MS-Access,Mysql. You can draw pictures on flies, write programs to download or display e-mail. You can even complete network-related functions. * you can choose which features are required for your PHP installation. To quote Nissan's Xterra, PHP can do whatever you want it to do and can do anything!

(3) competitor: ASP,mod_perl,JSP

I certainly don't know what ASP/JSP can do. But what is clear is how easy it is to write such code, how expensive it will be to buy them, and how expensive and powerful hardware they need. If you have any neutral views (such as not affected by the millions of dollars of SUN and Microsoft), please let me know by the way.

As far as I know, JSP is based on Java, so Java programmers can easily start coding. ASP is just a general engine with the ability to support multiple languages, but the default and most commonly used is VBScript.

Mod_perl is as powerful as Perl, but faster.

Thank you for reading! This is the end of this article on "introduction to the basics of php language". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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