Detailed introduction to the underlying development principles of PHP7: Understand the relationship between PHP kernel architecture and components

Detailed introduction to the underlying development principles of PHP7: Understand the relationship between PHP core architecture and components

PHP is a widely used server-side scripting language that can be embedded in HTML , used to develop dynamic web pages. The advantage of PHP is that it is easy to learn and integrates well with a variety of databases. For many developers, they hope to have an in-depth understanding of the underlying development principles of PHP in order to better utilize the powerful functions provided by PHP. This article will introduce the underlying development principles of PHP7 in detail to help readers deeply understand the relationship between PHP's core architecture and components.

1. PHP7 Kernel Architecture

The kernel architecture of PHP7 is mainly composed of the following parts:

• Zend Engine
• PHP Extension
• Compiler
• Runtime System

Zend Engine is the core part of the PHP interpreter, responsible for converting PHP source code into instructions that can be executed by the computer . It includes components such as lexical analyzer, syntax analyzer, interpreter and execution engine. Zend Engine interprets and executes PHP code by executing instructions and returns the results to the user.

PHP extension is a dynamic link library that can provide more functions and features for PHP. PHP extensions can be written in C and then called through PHP's API. PHP extensions can implement various functions, such as database connection, image processing, network communication, etc.

The compiler is a tool that compiles PHP source code into Zend virtual machine instructions. The compiler generates intermediate code after lexical analysis and syntax analysis of the source code, and then converts the intermediate code into instructions that can be executed by the computer through Zend Engine.

The runtime system is the execution environment of PHP, including memory management, thread management, I/O management, etc. The runtime system is responsible for managing the running status of PHP programs and providing interfaces for interacting with the operating system and hardware.

2. Relationship between PHP7 components

The components of PHP7 are related to each other, and the functions and features of PHP are realized through this relationship. The following are several important components and their relationships:

• Zend Engine and compiler: Zend Engine is responsible for interpreting and executing the compiled code and converting instructions into underlying machine code through the execution engine. The compiler is responsible for compiling source code into Zend virtual machine instructions and providing them to Zend Engine for execution.
• Zend Engine and PHP extension: Zend Engine provides a calling interface for PHP extensions, and PHP extensions can call the functions provided by Zend Engine. PHP extensions can extend the functions and features of PHP and provide developers with more choices.
• Runtime system and Zend Engine: The runtime system is responsible for managing the execution environment of PHP programs and providing necessary support for Zend Engine. For example, the runtime system is responsible for memory management and provides an interface for Zend Engine to allocate and release memory.

3. PHP7 code example

The following is a simple PHP7 code example to illustrate the basic syntax and features of PHP:

< ;?php
class Person
{

private $name;

public function __construct($name)
{
    $this->name = $name;
}

public function sayHello()
{
    echo "Hello, my name is " . $this->name . ".";
}

}

$person = new Person("John");
$person->sayHello();
?>

In this example, we define a class named Person, which has one private property and two public methods. After instantiating this class, we called one of the methods and output a greeting.

Through this example, we can see the object-oriented programming features of PHP7. PHP7 supports object-oriented programming, you can define classes and objects, and implement specific functions by calling object methods.

Summary:

This article introduces the underlying development principles of PHP7 in detail to help readers understand the relationship between PHP's core architecture and components. By deeply understanding the underlying principles of PHP, we can better utilize the functions and features provided by PHP, thereby developing more efficient and stable PHP applications. I hope this article can inspire readers and help them achieve greater achievements in PHP development.

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