The importance of understanding the underlying development principles of PHP7: Why you need to learn the PHP kernel in depth

The importance of understanding the underlying development principles of PHP7: Why you need to learn the PHP kernel in depth

Since its birth in 1994, PHP has been the most popular server-side script in the world One of the languages. As a PHP developer, we often pay attention to PHP syntax and commonly used function libraries, but few people have a deep understanding of the underlying working principles and core of PHP. However, the importance of understanding the underlying development principles of PHP7 cannot be ignored.

1. Improve code efficiency and performance
In-depth understanding of the underlying development principles of PHP7 can enable us to write more efficient code. By understanding the internal mechanism of PHP, we can avoid some inefficient programming methods and incorrect uses, thereby improving the efficiency and performance of the code. For example, the copy mechanism, variable scope, memory management, etc. in the PHP kernel will have an important impact on the efficiency of the code. Understanding these principles, we can optimize our code to reduce copy operations, rationally use variable scopes, rationally manage memory, etc., thereby improving the efficiency and performance of our code.

The following is a simple example that demonstrates how to improve performance by understanding the underlying principles of PHP:

<?php
$start = microtime(true);

// 普通的字符串拼接
$str = '';
for ($i = 0; $i < 10000; $i++) {
    $str .= 'a';
}
echo $str;

$end = microtime(true);
$execution_time = ($end - $start);
echo "代码执行时间：{$execution_time}秒";
?>

The above code uses ordinary string concatenation, and each loop will create a new string and copies the original string to the new string. Since PHP strings are immutable, each splicing will trigger a copy operation. As the number of loops increases, the cost of the copy operation will rise sharply. However, we can optimize this code by understanding the underlying principles and convert the splicing operation into an array operation, thereby improving performance:

<?php
$start = microtime(true);

// 使用数组拼接
$arr = array();
for ($i = 0; $i < 10000; $i++) {
    $arr[] = 'a';
}
$str = implode('', $arr);
echo $str;

$end = microtime(true);
$execution_time = ($end - $start);
echo "代码执行时间：{$execution_time}秒";
?>

By using the array splicing method, we avoid copying during the string splicing process Operation, save the multiple concatenated strings in an array, and use the implode function to convert the array into a string. Compared with the previous method, the execution efficiency of this code is greatly improved and the running time of the program is reduced.

2. Solve underlying problems and faults
In-depth understanding of the underlying development principles of PHP7 enables us to better discover and solve underlying problems and faults. When we encounter some strange phenomena or some features of PHP confuse us, understanding the bottom layer of PHP can help us analyze the problem in depth and solve these underlying problems. By understanding the internals of PHP, we can better understand how PHP works and be able to identify the root causes of some underlying problems.

The following is a simple example that demonstrates how to solve underlying problems by understanding the underlying principles of PHP:

<?php
// 使用超过限制内存的数据集合
$arr = array();
for ($i = 0; $i < 100000000; $i++) {
    $arr[] = 'a';
}
?>

The above code attempts to create an array containing 100000000 elements, but due to memory limitations, PHP will throw out of memory errors. However, by in-depth understanding of the underlying principles of PHP, we can know that the default memory limit of PHP is 128M, so the memory_limit parameter in the php.ini file can be modified to increase the memory limit and solve this problem.

3. Implementation and extension of advanced functions
Only by deeply understanding the underlying development principles of PHP7 can we achieve some advanced functions and extensions. The PHP core provides rich APIs and extension mechanisms. Through these mechanisms, we can customize the behavior of PHP and implement some advanced functions. For example, we can create custom PHP functions through the extension mechanism, access the underlying system resources through the kernel API, and so on. These advanced features and extensions cater to our specific needs and provide more flexibility during development.

The following is a simple example that demonstrates how to achieve advanced functions and extensions by deeply understanding the underlying principles of PHP:

#include <php.h>
#include <stdio.h>

PHP_FUNCTION(hello_world) {
    printf("Hello, World!
");
}

zend_function_entry my_ext_functions[] = {
    PHP_FE(hello_world, NULL)
    {NULL, NULL, NULL}
};

zend_module_entry my_ext_module_entry = {
    STANDARD_MODULE_HEADER,
    "my_ext",
    my_ext_functions,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    PHP_MY_EXT_VERSION,
    STANDARD_MODULE_PROPERTIES
};

ZEND_GET_MODULE(my_ext)

The above code is a simple PHP extension example. Through the extension mechanism, We can create a custom function hello_world in PHP. By understanding the API and extension mechanism of the PHP core, we can use C language to write our own PHP extensions to implement some advanced functions and extensions to meet special needs.

Summary
In PHP development, the importance of understanding the underlying development principles is self-evident. By having an in-depth understanding of the underlying development principles of PHP7, we can write more efficient code and improve the performance of the code; we can better solve underlying problems and faults and improve development efficiency; and ultimately we can implement some advanced functions and extensions, providing more flexibility sex. Therefore, in-depth learning of the PHP kernel is a very important task for PHP developers. I hope this article can be helpful to everyone.

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