What does php do?

php is "hypertext preprocessor", which is a scripting language executed on the server side and used for web development; the functions of php are: 1. Generate dynamic page content; 2. Create, open, and read , write, delete and close files on the server; 3. Receive form data; 4. Add, delete and modify data in the database; 5. Restrict users from accessing certain pages in the website; 6. Encrypt data, etc.

The operating environment of this tutorial: Windows 10 system, PHP version 8.1, DELL G3 computer

What does php do?

PHP (PHP: Hypertext Preprocessor) is a "hypertext preprocessor". It is a scripting language executed on the server side. It is especially suitable for Web development and can be embedded in HTML. PHP syntax learned the C language, absorbed the characteristics of multiple languages ​​​​of Java and Perl to develop its own unique syntax, and continued to improve itself based on their strengths, such as Java's object-oriented programming. The main goal of the language was originally created to make Developers quickly write high-quality web sites. PHP supports both object-oriented and process-oriented development, and is very flexible in use.

What can PHP do?

• PHP can generate dynamic page content

• PHP can create, open, read, write, delete and close the server File

• PHP can receive form data

• PHP can send and retrieve cookies

• PHP can add, delete, and modify data in the database

• PHP can restrict users from accessing certain pages in the website

• PHP can manipulate data Encryption

php language features

• Open source and free

PHP It is an open source software project with a large audience and many developers. Linux Nginx Mysql PHP is its classic installation and deployment method. All related software is open source and free, so using PHP can save a lot of genuine licensing fees. However, as an open source software, PHP lacks the support background of large technology companies, and its pessimism on the Internet is also enduring. However, the reality of its continuous iteration and performance enhancement is inspiring. The PHP community uses practical actions to Give a strong reply to all kinds of doubts.

• Fast and efficient

The core of PHP is written in C language and is very efficient. You can use C language to develop high-performance extension components; The core of PHP contains more than 1,000 built-in functions. The functions are comprehensive and the out-of-the-box program code is simple. PHP arrays support dynamic expansion and support associative arrays with numbers, strings or mixed key names, which can greatly improve development efficiency. ; PHP is a weakly typed language, with a high program compilation pass rate and faster development efficiency than other strongly typed languages; PHP is naturally hot-deployed, and hot deployment is completed when the code file is covered in the php-fpm operating mode; PHP has been developed for more than 20 years , you can find a large number of reference materials on the Internet for reference and study.

• Performance improvement

The higher the PHP version, the higher its overall performance. According to the official introduction, the performance of PHP7.0.0 is better than that of PHP5.6 Improved by 2 times, PHP7.4 is already about 30% faster than PHP7.0, and PHP8.0 has improved performance by about 10% compared to PHP7.4. PHP 8.0 introduces JIT compiler features and adds a variety of new language features such as named parameters, union types, annotations, Constructor Property Promotion, match expressions, nullsafe operators, and improvements to the type system, error handling, and consistency . PHP has its own core development team, which maintains the frequency of releasing one major version every five years and two minor versions every month. The latest version is PHP8.08. PHP 7.0.0 was released on 2015-12-03. The latest version of this version is PHP 7.4.21 [18] (release date: 2021-07-01). PHP 8.0.0 was released on 2020-11-26. This version The latest version is PHP 8.0.8 (release date: 2021-07-01).

• Cross-platform

Each platform has a corresponding php interpreter version, which means that the binary code of the target platform is compiled for different platforms (PHP interpreter), PHP-developed programs can run on multiple operating systems such as windows, linux, and unix without modification.

• Resident memory

In php-cli mode, the program can be resident in memory, and various variables and database connections can be stored in the memory for a long time. Memory[9] To achieve resource reuse, a common approach is to write a cli framework in combination with the swoole component.

• Page life cycle

In php-fpm mode, all variables are page-level, whether they are global variables or classes Static members will be cleared after the page is executed. They require low programmer skills and occupy very little memory. They are especially suitable for the development of small and medium-sized systems.

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of What does php do?. For more information, please follow other related articles on the PHP Chinese website!