PHP: What is this programming language and why is it popular?

PHP: What is this programming language and why is it so popular?
The first property of the PHP language: interpretability
The second property of the PHP language: weak dynamic typing
Comparison of versions of the PHP programming language: from the first to the seventh
HipHop and a breakthrough in speed
PHP 8: What's new?
What is PHP used for?
Where to start learning?

Learn: PHP Developer from Scratch to PRO

PHP is an interpreted scripting programming language that is widely used for creating web applications. The name PHP is a recursive acronym that stands for PHP: Hypertext Preprocessor. The language was originally developed under the name Personal Home Page Tools. Due to its simplicity and flexibility, PHP has become a popular choice for web developers, allowing them to effectively create dynamic web pages and manage data on the server. PHP supports many databases and integrates with various web servers, making it a versatile development tool.

Over the course of over 20 years, PHP has evolved from a simple scripting tool into a full-fledged web programming language. Today, it consistently ranks among the top 10 most popular programming languages according to TIOBE. PHP continues to develop rapidly, offering developers a wealth of opportunities for creating dynamic and interactive web applications.

PHP: What is this programming language and why is it so popular?

PHP was developed for creating web pages and allows for the development of resources of varying complexity—from simple landing pages to large social networks such as VKontakte, which is also written in this language. PHP code can be easily integrated into standard HTML by simply adding the appropriate tag. PHP is compatible with most popular operating systems, including Windows, macOS, Linux, and UNIX. Using PHP opens up a wide range of opportunities for web developers, allowing them to create dynamic and interactive web applications.

PHP provides compatibility with various web servers, including IIS on Windows and Apache on macOS and Linux. This versatility allows developers to freely choose the appropriate web server and operating system without facing limitations. Thanks to this, PHP remains one of the most popular programming languages for web development, making it an excellent choice for creating dynamic and scalable web applications.

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The first property of PHP: interpretability

PHP differs from Java in that PHP code is interpreted on the server when it is accessed. When a user opens a website, a request is sent to the server, where the PHP code is compiled and executed. Each script is processed in real time, allowing content to be dynamically generated based on user requests. This feature makes PHP an ideal choice for developing dynamic web applications and sites that require a quick response to user actions.

The code example we'll look at demonstrates basic programming principles. It's important to understand that the code structure should be logical and understandable. Use comments for clarification to make the code easier for other developers to understand. Also, pay attention to proper formatting, as this promotes better reading and understanding. Adhering to coding standards helps avoid errors and improves the quality of the final product. Don't forget to test your code for errors and optimize it for performance. A proper approach to writing code will significantly simplify the development process and subsequent support of the project.

PHP is highly flexible, which makes it a unique programming language. Unlike Java, where class names are fixed at compile time and cannot be changed, PHP allows for dynamic class names. This is achieved through runtime compilation, which allows developers to use variables to define class names. This feature makes PHP especially suitable for developing dynamic web applications, where code mutability and adaptability play a key role.

Runtime is the period when a program is executed on a computer or other device. It includes all processes that occur while an application is running, from its launch to its completion. The runtime environment provides the necessary resources and libraries that allow the program to interact with hardware and other system components. Understanding the runtime is important for developers, as it can impact the performance and stability of applications. Optimizing the runtime can lead to an improved user experience and reduced resource costs.

Software created using programming languages such as C, C++, and Java goes through two main stages: compilation and execution. In the first stage, all instructions are converted into binary code consisting of 1s and 0s that the computer can process. The second stage is execution, when the computer executes each command sequentially. C, C++, and Rust clearly separate these two stages, making them compiled languages. This separation allows for performance optimization and greater control over the program execution process.

In PHP and JavaScript, the processes of compilation and execution are combined. Once an instruction is converted into machine code, it is immediately executed, without a separate compilation step for the entire code. Such programming languages are called interpreted. This allows developers to quickly test and implement changes to the code, which significantly speeds up the development process and increases flexibility in working with applications.

Developers often sacrifice website speed for flexibility. Unlike Java, where the program is compiled once and then run, PHP requires the code to be compiled each time it is executed. This leads to increased page load time and can negatively impact the user experience. Code optimization and the use of caching can help reduce compilation times and improve the performance of a PHP website.

The second property of the PHP language: weak dynamic typing

In programming, a data type represents the set of values that a variable can take, as well as the set of operations available for working with these values. Each data type determines what operations can be performed and how the data will be stored in memory. Understanding data types is important for effective programming, as it affects the performance and safety of code. Choosing the right data type helps avoid errors and optimize application performance.

Data types may behave differently in different programming languages. In this regard, it is customary to distinguish several main types of typing. Each of these typings has its own characteristics and can significantly affect software development. A proper understanding of data types and their behavior in a particular programming language is a key aspect for effective coding and preventing errors.

by type definition time - static and dynamic typing;
by the constancy of the set of values - weak and strong typing.

In programming languages with static typing, the type of a variable is determined at compile time and remains unchanged throughout the execution of the program. The programmer must explicitly specify the type of the variable using special keywords. For example, for an integer, the int type is used, and for strings, the string type. This helps reduce the number of errors and improve performance, since the compiler can optimize the code taking into account known data types. Static typing provides greater code reliability, allowing developers to identify errors early and improve program readability.

In dynamically typed languages, variables can change their type during program execution. This means that the same variable can accept values of different types, such as a number, string, array, or object. The interpreter automatically determines the data type based on the context in which the variable is used, for example, depending on the operation performed on it. Dynamic typing simplifies development by allowing more flexible work with data, but can also lead to errors if type changes are not taken into account.

Dynamic typing gives the developer flexibility in working with data types, allowing them to focus on the application logic without having to strictly adhere to type constraints. However, this approach can lead to difficult-to-detect logic errors, which complicates debugging. Furthermore, dynamic typing can negatively impact program performance, increasing execution time and memory consumption. It is important to consider these aspects when choosing a dynamically typed programming language, especially for large and complex projects where stability and performance are critical.

Comparison of PHP Programming Language Versions: From One to Seven

The first three versions of the software were underdeveloped and provided only basic functionality, which made it possible to create simple websites. However, developers noted that the unintuitive arrangement of parameters in the standard library functions significantly complicated the process of working with them.

Since the release of version 5.4, PHP has become a stable and reliable technology for web development. Releases 5.5 and 5.6 strengthened the language's position, providing high security and protection against SQL injections and other vulnerabilities. Version 6 was planned to implement Unicode support at the core level, but its release never took place. As a result, developers continued to actively use the 5.x versions, which demonstrated excellent performance and security.

PHP 6 was an ambitious project, but did not live up to expectations. That is why the developers focused on PHP 7, skipping the sixth version. PHP 7 brought significant improvements in performance and stability, making it one of the most popular programming languages for web development. The transition to PHP 7 opened up new opportunities for developers and made it possible to create faster and more efficient web applications.

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The seventh version is revolutionary in terms of data processing speed. The previous version, 5.6, had issues with slow handling of arrays and variables, which negatively impacted performance. Processing statically untyped data took significant time, and strings were processed 60 times slower than in C#. While the difference may seem insignificant at the fraction of a second level, for applications as large as Facebook's, speed becomes critical. The updated version significantly improves performance, which is especially relevant for applications with a billion users.

HipHop and a Speed Breakthrough

Facebook is developed in PHP, which became a significant challenge as the number of users increased. To address this issue, the developers created their own interpreter for the fifth version of the language. They began by compiling the code into an intermediate format, which was then processed by the standard Zend Engine interpreter. By implementing static typing, Facebook's programmers were able to double the language's performance, a significant step forward. This compiler was named HHVM, or HPHP Compiler, which stands for "HipHop for PHP."

The PHP development team worked hard to improve array handling, which became the basis for the creation of the seventh version of the language. This version demonstrates significantly higher performance compared to HHVM. However, it is worth noting that static typing in PHP 7 remains limited. It is implemented only in function parameters, which makes it virtually invisible to most developers. Thus, despite the improvements, the issue of static typing in PHP still requires attention.

Each new version of the programming language, starting with 7.0, demonstrates a significant increase in speed compared to previous versions. This improvement can be seen in performance measurements. Updates to the architecture and code optimization contribute to faster task execution and reduced data processing time. Users can count on high efficiency and performance in their projects using the latest versions of the language.

PHP Version Benchmark Results on WordPress

PHP 8: What's New

PHP continues to develop rapidly, and in this regard, we We updated this article on November 2, 2022, to provide up-to-date information and the latest language features. Stay up-to-date with the latest changes in PHP to improve your programming skills and take advantage of all the benefits the language has to offer.

In 2020, PHP 8 was released, and was greeted with enthusiasm by web developers. One of the key innovations was JIT compilation, which, according to the community, can speed up web applications by up to three times. PHP 8 also introduced named parameters, significantly simplifying the passing of arguments to functions, and a new, concise match operator, replacing the familiar switch statement. Furthermore, language safety was improved with the addition of the nullsafe operator, which terminates the execution of a method chain if one of them returns null, preventing errors. These changes make PHP 8 a more efficient and secure tool for web development.

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Updating PHP on Your Website: Importance and Process

Updating the PHP version on your website is critical to ensuring its security, performance, and compatibility with modern web technologies. PHP is one of the most popular programming languages for creating dynamic web pages, and its regular updates fix known vulnerabilities, improve performance, and add new features.

The first thing to consider is security. With each new version of PHP, developers eliminate potential threats and vulnerabilities that can be exploited by attackers. Ignoring updates can lead to serious security issues for your site, which in turn can negatively impact the reputation of your business.

Furthermore, updating PHP can significantly improve the performance of your site. New versions often contain optimizations that allow your web application to run faster and more efficiently. This is especially important for high-traffic sites where every millisecond counts.

Compatibility with modern libraries and frameworks also plays an important role. Many popular tools and plugins require the latest version of PHP to function correctly. Updating the programming language will allow you to use the latest technologies and features, which in turn will provide a better user experience for your visitors.

Updating PHP on your website requires several steps. First, back up your site and database to avoid data loss in case of unexpected errors. Next, check the compatibility of your current plugins and themes with the new PHP version. After that, you can proceed with the update through the hosting control panel or using the command line, depending on your skills.

Regular PHP updating is not only a matter of security but also a matter of optimizing your website, making it an essential part of effective web resource management. Remember to keep up with new versions and update PHP promptly to keep your site secure and productive.

In 2021, the PHP 8.1 update was released, introducing several significant improvements. One of the key new features is the supported enum type, which was previously replaced by classes with constants. The update also adds read-only properties, which function like get methods but have a more concise syntax. A full list of changes and innovations can be found on the official PHP website.

PHP 8.2 is expected to be released on November 24, 2022. This update will introduce new features such as read-only classes, an improved pseudo-random number generator, and a number of other functions that will help developers write more secure and concise code. A test version is already available for download, allowing users to get acquainted with the new features in advance and prepare for the transition to the updated version of the language.

What is PHP used for?

PHP is a primary tool in web development. This programming language is not designed for creating desktop applications and is not used in mobile development—its scope is limited exclusively to the web. However, the web continues to expand. Many desktop applications are moving online, such as the Microsoft Office cloud service. Previously, there was a belief that PHP was unsuitable for large, high-load projects, but the experience of companies like Facebook has disproved this assumption. Avito is also a good example of successful PHP use. Learn more about the practical applications of the PHP programming language in our article "What is PHP Used For and Why People Hate It." We'll cover the main uses of PHP, its advantages and disadvantages, and the reasons why developers may have negative feelings about it. This information will be useful for both beginners and experienced programmers looking to deepen their knowledge of PHP and its role in web development.

Where to Start Learning

PHP is easy to learn on your own thanks to its low entry barrier. In just one evening, you can read the documentation and write a simple script that will return data to a website. Unlike other programming languages, such as C# and Java, which require more time and effort to create working code, PHP is easy to learn. As a result, the Russian job market is full of PHP developers, but most of them have a low skill level. This creates both opportunities and challenges for employers looking for qualified specialists.

PHP consistently remains at the top of the most popular development languages, despite endless claims of its imminent death Screenshot: TIOBE

A good PHP developer uses the same programming patterns as in Statically typed languages such as Java or C#. PHP programming can be more challenging due to its dynamic typing. For example, if you make a type error with variables in Java or C#, the compiler will immediately point out the problem. In PHP, however, such an error may go unnoticed, leading to confusion and difficulty in identifying the cause of the incorrect code. Despite this, in today's job market, highly qualified PHP programmers are valued equally with developers of other languages. However, finding a true specialist in this field is not easy, making their services especially in demand.

To effectively learn a language, it's important to ask yourself: "What is my goal?" Learning a language simply for the sake of it doesn't make sense, as knowledge is quickly forgotten without practical application. You need to define a specific task and focus on finding solutions that will allow you to use the language in real-world situations. This will provide motivation and help you better understand the material.

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