Table of Contents
" >All serialization
Serialize the specified class object $str=serialize($per) //Serialize the per object and return the result to $str " >##1.serialize(object name) Serialize the specified class object $str=serialize($per) //Serialize the per object and return the result to $str
Deserialization, the return result is an object $per=unserialize($str);" >2.unserialize (return value after serialization) Deserialization, the return result is an object $per=unserialize($str);
" >Partial serialization
Serialize a certain Some properties of the object. " >1.sleep() Serialize a certain Some properties of the object.
When deserializing, initialize (actually modify) the object content" >2.wakeup() When deserializing, initialize (actually modify) the object content
Home Backend Development PHP Tutorial PHP object-oriented - detailed code explanation of object serialization serialize(), __sleep(), __wakeup()

PHP object-oriented - detailed code explanation of object serialization serialize(), __sleep(), __wakeup()

Mar 27, 2017 am 09:43 AM

Sometimes it is necessary to upload an object to the network for transmission. In order to facilitate transmission, the entire object can be converted into a binary string, and then restored to the original when it reaches the other end. Object, this process is called serialization (also called serialization), just like we now want to transport a car to the United States by ship, because the car is relatively large, we can dismantle the car into smaller ones parts, and then we ship these parts to the United States by wheel, and then assemble these parts back into the car. Generally speaking, serialization is a method of converting the "memory" data represented by a
variable into a "string" data form and persisting it on the hard disk; while deserialization It's a reverse process. There are two situations where we must serialize objects. The first situation is to serialize an object when transmitting it over the network. The second situation is to write the object to a file or database. Serialization is sometimes used.
There are two processes in serialization. One is serialization, which is to convert the object into a binary string. We use the serialize() function to serialize an object, and the other is deserialization (also called Deserialization) is to convert the binary string converted from the object into an object. We use the unserialize() function to deserialize an object.
The parameter of the serialize() function in PHP is the object name, and the return value is a string. The string returned by Serialize() has ambiguous meaning. Generally, we will not parse this string to get the object information. We only need to return This string can be transmitted to the other end of the network or saved to a file.
The unserialize() function in PHP is used to deserialize objects. The parameter of this function is the return value of the serialize() function. The output is of course the reorganized object.
 

Serialization of objects:

  1. Serializing an object can only "save" its attribute data, and the method is Ignore (method is not data)

  2. When an object is serialized, the magic method of the class to which the object belongs is automatically called: sleep()

Deserialization of objects:

  1. Deserializing an object is actually the attribute data originally saved during the recovery period, and you must rely on it at this time. The object's original class.

  2. When an object is deserialized, the magic method of the class to which the object belongs is automatically called: wakeup()

All serialization

##1.serialize(object name) Serialize the specified class object $str=serialize($per) //Serialize the per object and return the result to $str


Serialization method:

$v1 = 123; //这是一个变量,代表任意的内存数据$s1 = serialize( $v1 );  //将任何类型的变量数据,转换为“字符串”
file_put_contents( '要保存的目标文本文件', $s1 );    //将该字符串,保存到一个文件里(就是硬盘数据)
Copy after login

2.unserialize (return value after serialization) Deserialization, the return result is an object $per=unserialize($str);

Deserialization practice:

$s1 = file_get_contens( '保存序列化数据的目标文本文件' );    //从一个文件里读出其中的所有字符
$v1 = unserialize($s1);   //将该字符串数据,反序列化转换为变量(数据)
Copy after login

Examples of serialization and deserialization

<?phpclass Person{
    var $name;   
    var $sex;    
    var $age;    

    function construct($name = "", $sex = "", $age = "") {
        $this->name = $name;        
        $this->sex = $sex;        
        $this->age = $age;
    }    function say() {
        echo "我的名字叫:" . $this->name . " 性别:" . $this->sex . " 我的年龄是:" . $this->age . "<br>";
    }
}$p1 = new Person("张三", "男", 20);$p1_string = serialize($p1);    //把一个对象串行化,返一个字符串
echo $p1_string . "<br>";        
//串行化的字符串我们通常不去解析//将$p1_string存储到文件file.txt中file_put_contents(&#39;./file.txt&#39;, $p1_string);
$p2 = unserialize($p1_string);    //把一个串行化的字符串反串行化形成对象
$p2$p2->say();//下面的做法和上面效果一样
$p3_file = file_get_contents(&#39;./file.txt&#39;); //读取文件
$p3 = unserialize($p3_file); //反序列化
$p3->say();?>
Copy after login
Output results of the above example:

O:6:"Person":3:{s:4:"name";s:4:"张三";s:3:"sex";s:2:"男";s:3:"age";i:20;}我的名字叫:张三 性别:男 我的年龄是:20
Copy after login

Partial serialization

1.sleep() Serialize a certain Some properties of the object.

2.wakeup() When deserializing, initialize (actually modify) the object content

In PHP5 The two magic methods sleep() method and wakeup() method. When the object is serialized, a sleep() method will be called to complete some things before going to bed; and when it wakes up again, it will re-form a binary string. object, another PHP function wakeup() will be automatically called to do some actions that the object will do when it wakes up. The sleep() function does not accept any parameters, but returns an

array
containing the attributes that need to be serialized. Attributes that are not included will be ignored during serialization. If there is no sleep() method, PHP will save all attributes.

The output of the above example is:

O:6:"Person":2:{s:4:"name";s:4:"张三";s:3:"age";i:20;}我的名字叫:张三 性别: 我的年龄是:40
Copy after login

The above is the detailed content of PHP object-oriented - detailed code explanation of object serialization serialize(), __sleep(), __wakeup(). For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

7 PHP Functions I Regret I Didn't Know Before 7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

See all articles