Detailed explanation of serialization usage examples in PHP

The examples in this article describe the usage of serialization in PHP. Share it with everyone for your reference, the details are as follows:

Function: Serialization is used to store or transmit objects, and the object is obtained through deserialization.

1. Person.class.php：

<?php
/*
作者 : shyhero
*/
class Person{ //声明一个Person类
  public $age;
  private $name;
  protected $sex;
  public function __construct($age="",$name="",$sex=""){
   $this -> age = $age;
   $this -> name = $name;
   $this -> sex = $sex;
  }
  public function say(){
   return $this -> age." ".$this -> name." ".$this -> sex;
  }
  function __sleep(){ //指定串行化时能提取的成员属性,没有参数,但是必须返回一个数组
   $arr = array("age","name");
   return $arr;
  }
  function __wakeup(){ //指定反串行化时,提取出来的值
   $this -> sex = "woman";
  }
}

2. Serialization code

<?php
  require("./Person.class.php");
  $p = new Person(21,"du","man"); //定义Person类对象
  $pString = serialize($p);  //对对象进行串行化
  file_put_contents("./file.txt",$pString);//存到文件里

3. Deserialization code

<?php
  require("./Person.class.php");//反串行化时,也要包含原类
  $pString = file_get_contents("./file.txt");//从文件中取出串行化的值
  $p = unserialize($pString);//进行反串行化
  var_dump($p);  //这个 $p就是之前那个串行化的对象,一样用,但是里面的值被我改了

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