Introduction to the underlying development principles of PHP7: Understand the design ideas of kernel data structures and algorithms

Introduction to the underlying development principles of PHP7: Understand the design ideas of kernel data structures and algorithms

PHP is a popular server-side scripting language that is widely used in Web development. In PHP 7, many low-level improvements were introduced to improve performance and stability. This article will briefly introduce some principles of the underlying development of PHP7, including the design ideas of kernel data structures and algorithms, and attach code examples.

1. Kernel Data Structures

In PHP7, many underlying data structures have been optimized and improved to improve performance. One of them is the Hash Table, which is used to implement associative arrays in PHP. Hash tables in PHP7 use more efficient storage and lookup methods to reduce conflicts and improve performance.

The following is a simple sample code that shows how to use a hash table to store and access data in an associative array:

<?php
// 创建一个空的关联数组
$person = [];

// 添加数据
$person['name'] = 'John';
$person['age'] = 25;
$person['city'] = 'New York';

// 访问数据
echo $person['name'];  // 输出：John
echo $person['age'];   // 输出：25
echo $person['city'];  // 输出：New York
?>

2. Algorithm design ideas

In the underlying development of PHP7, many efficient algorithms are also applied to improve performance and reduce resource consumption. One of them is the Zval reference counting algorithm.

In PHP, variables are stored and operated in the Zval structure. Prior to PHP7, each variable was copied multiple times, resulting in poor performance. In PHP7, by introducing the reference counting algorithm, repeated copying of variables can be reduced and performance improved.

The following is a simple sample code that shows the application of Zval reference counting algorithm in PHP7:

<?php
// 定义两个变量
$a = 10;
$b = 20;

// 将变量 $b 的值赋给变量 $a
$a = $b;

// 修改变量 $b 的值
$b = 30;

// 输出变量 $a 和 $b 的值
echo $a;  // 输出：20
echo $b;  // 输出：30
?>

In the above code, the initial value of variable $a is 10, and the variable The value of $b is 20. Sharing of variable values ​​can be achieved by assigning the value of variable $b to variable $a. When the value of variable $b is modified, the value of variable $a also changes accordingly.

Through the optimization of the above algorithm, PHP7 can handle variable assignment and modification operations more efficiently, thus improving overall performance.

Summary:

This article briefly introduces some principles of underlying development of PHP7, including the design ideas of kernel data structures and algorithms. It involves the principles and applications of hash tables and Zval reference counting. For readers who want to understand the underlying development of PHP7 in depth, I hope this article can provide some reference and inspiration.

The above is the detailed content of Introduction to the underlying development principles of PHP7: Understand the design ideas of kernel data structures and algorithms. For more information, please follow other related articles on the PHP Chinese website!