Is php a video or a picture?

php is not a video or a picture, php is a powerful server-side scripting language for creating dynamic interactive sites; PHP syntax is learned from C language, absorbing the characteristics of multiple languages ​​​​of Java and Perl to develop its own characteristic syntax, and continue to improve themselves based on their strengths.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3 computer.

php is a video or a picture?

php is not a video or a picture. PHP is a powerful server-side scripting language for creating dynamic, interactive sites.

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.

After more than 20 years of development, with the rapid development and improvement of php-cli related components, PHP can already be applied in TCP/UDP services, high-performance Web, WebSocket services, Internet of Things, real-time communication, System development in non-Web fields such as games and microservices.

According to statistics released by W3Techs on December 6, 2019, PHP’s share of the programming language used on the WEB website server is as high as 78.9%. Among websites with content management systems, 58.7% use WordPress (CMS system developed by PHP), which accounts for 25.0% of all websites.

Language features

Open source and free

PHP 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 based on the C language and is very efficient. You can use C language to develop high-performance extension components; the core of PHP contains a number of There are more than 1,000 built-in functions, all the functions are comprehensive, and the program code that can be used out of the box is simple; [27] PHP arrays support dynamic expansion and support associative arrays with numbers, strings or mixed key names, which can greatly improve development efficiency; [28] ] 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; after more than 20 years of development, PHP , 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 [15] has improved by 2 compared to PHP5.6 Times, PHP7.4 is already about 30% faster than PHP7.0, and PHP8.0 has improved performance by about 10% relative 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 [16] . PHP 7.0.0 [17] was released on 2015-12-03. The latest version under this version is PHP 7.4.21 [19] (release date: 2021-07-01), PHP 8.0.0 [18] was released on 2020- 11-26, the latest version under this 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 (PHP interpreter) of the target platform is compiled for different platforms. Programs developed in PHP can run on multiple operating systems such as windows, linux, and unix without modification.

Resident memory

In php-cli mode, the program can be implemented in resident memory, and various variables and database connections can be stored in memory for a long time [10] Implementation resources For reuse, a common approach is to write a cli framework in combination with swoole [9] components.

Page life cycle

In php-fpm mode, all variables are page-level, whether they are global variables or static members of the class, they will be on the page It is cleared after execution. It requires low programmer skills and takes up very little memory. It is especially suitable for the development of small and medium-sized systems.

Recommended learning: "PHP Video Tutorial"

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