PHP7 underlying development principles manual: learn the basic concepts and key technologies of the PHP kernel

PHP7 Underlying Development Principles Manual: Learn the basic concepts and key technologies of the PHP kernel

Abstract:
With the continuous development of the Internet, PHP has become a widespread Scripting languages ​​used in web development are also attracting more and more attention from developers. However, for many PHP developers, they only know how to use PHP for programming, but they know very little about the underlying development principles of PHP. This article will introduce the basic concepts and key technologies of PHP7 underlying development, and help readers have a deeper understanding of the PHP core through code examples.

Part 1: Basic concepts of PHP underlying development

1. Introduction to PHP kernel
   PHP kernel refers to the core part of the PHP interpreter. Through the PHP kernel, we can implement customized PHP extends and modifies PHP's internal behavior. Understanding how the PHP core works is crucial for low-level development.
2. Basic data structure
   A variety of data structures are used in the PHP kernel to process variables, functions and other information. These include hash tables, linked lists, arrays, etc. Understanding the characteristics and usage of these data structures is very helpful for understanding the PHP core.
3. Memory Management
   The PHP kernel uses its own memory management mechanism to manage variables and other memory resources. Understanding the memory management method of the PHP kernel can help us reduce problems such as memory leaks and improve the performance and stability of the code.

Part 2: Key technologies for underlying PHP development

1. ZVAL structure
   In the PHP kernel, ZVAL is the most common data type. Understanding the definition and usage of the ZVAL structure can help us better handle the internal representation of variables and functions and improve the execution efficiency of the code.

Sample code 1: Create a variable of type ZVAL

zval my_variable;
ZVAL_LONG(&my_variable, 123); // 创建一个整型变量

2. Kernel API call
   PHP kernel provides a wealth of API functions for operating variables and functions and internal objects such as classes. Understanding how to use the kernel API can help us fine-tune the internal behavior of PHP.

Sample code 2: Calling the kernel API function

zval my_function_name;
ZVAL_STRING(&my_function_name, "my_function_name");
call_user_function(EG(function_table), NULL, &my_function_name, my_return_value, 0, NULL);

3. Extension development
   PHP extension is a module that can be written in C language and is used to extend PHP Function. Understanding the development process and principles of PHP extensions allows us to write more efficient and powerful PHP extensions.

Sample code 3: Write a simple PHP extension

PHP_FUNCTION(my_custom_function)
{
    RETURN_STRING("Hello, World!", 1);
}

zend_function_entry my_custom_functions[] = {
    PHP_FE(my_custom_function, NULL)
    PHP_FE_END
};

zend_module_entry my_custom_module_entry = {
    STANDARD_MODULE_HEADER,
    "my_custom_extension",
    my_custom_functions,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    PHP_MY_CUSTOM_VERSION,
    STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE(my_custom_extension)

Conclusion:
Mastering the basic concepts and key technologies of PHP7 underlying development can allow us to better understand PHP Internal mechanisms to improve code performance and quality. Through the code examples provided in this article, readers can learn and practice the underlying development of PHP more deeply and further explore the infinite possibilities of PHP.

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