php class knowledge --- craziest magic method serialize, _sleep, __ wakeup, unserialize, __ autoload, __ clone

• ----- the serialize the instantiated objects written to the file
• __sleep triggered when calling serialize

<?php

class mycoach
{
    public function __construct($name,$age,$expertin=[]){

        $this->name = $name;
        $this->age = $age;
        $this->expertin=[];
        $this->expertin=$expertin;
    }

    public function __sleep()
    {
        return ['name','age','expertin'];
    }
}

CPC $ = new new mycoach ( ' Chenpei Chang ' , 22 , [ ' Sanda ' , ' Thai boxing ' , ' BJJ ' ]); 
$ srobj = the serialize ($ CPC); 
file_put_contents ( ' cpcssecret.txt ' , $ srobj);
 ?> 

key points: 
internal ---- class implementation __sleep () to return an array of data structures, elements from all classes of property, in order to achieve what type of control can be written to the file 
---- serialize method object as a parameter the return value is the data file to be written. 
Generating an object file recorded in the form of:

O: 7: "mycoach": 3: {s: 4: "name"; s: 9: "Chen Peichang"; s: 3: "age"; i: 22; s: 8: "expertin"; a: 3 : {i: 0; s: 6: "Sanda"; i: 1; s: 6: "Thai boxing"; i: 2; s: 12: "BJJ";}}

 

• ----- to unserialize recording file restore instance of the object class
• Called when execution unserialize __wakeup ------, to perform some initialization

<?php

class mycoach
{
    public function __construct($name,$age,$expertin=[]){

        $this->name = $name;
        $this->age = $age;
        $this->expertin=[];
        $this->expertin=$expertin;
    }

    public function __sleep()
    {
        return ['name','age','expertin'];
    }

    publicthe __wakeup function () 
    { 
        # Usage: to restore an object (deserialization) time, to be initialized 
        echo " restore object " . " \ n- " ; 

    } 
} 

$ objdate = file_get_contents ( ' cpcssecret.txt ' ); 
var_dump ( to unserialize ($ objdate));
 >? 

output: 
restore object 
Object (mycoach) #. 1 (. 3) { 
  [ "name"] => 
  String (. 9) "Chen Peichang" 
  [ "Age"] => 
  int (22 is) 
  [ "expertin"] => 
  Array (. 3) { 
    [0] => 
    String (. 6) "Sanda" 
    [. 1] => 
    String (. 6) "Thai boxing"
    [2] => 
    String (12 is) "BJJ"
  }
}

• clone copy object properties
• __clone can restrict which properties can be copied, which uses a custom property
• __autoload only way to use the class definition vitro