What are the php magic methods?

php magic method: 1. [_sleep()] controls the actual processing part when the object is serialized; 2. [_wakeup()] restores the object attributes after deserialization; 3. [_toString()] Mechanism for converting objects into strings.

The operating environment of this tutorial: Windows 7 system, PHP version 5.6, DELL G3 computer.

php magic method:

_sleep() can control the part that is actually processed when the object is serialized

_wakeup() restores after deserialization Object attributes

_toString() Mechanism for converting objects into strings

Convert PHP variables into a string of encoded strings, the method is serialize() Deserialize unserialize()

  //序列化
  class testSerialize{
   public $a = 10;
   public $b = 15;
   public $c = 20;
   function _construct(){
   $this->b = $this->a * 10;
   $this->c = $this->b * 2;
   } 
  }
$k = serialize(new testSerialize());
echo $k;//
out:  O:13:"testSerialize":3:{s:1:"a";i:10;s:1:"b";i:15;s:1:"c";i:20;}
$j = unserialize($k);

sleep method:

class testSerialize1{
   public $a = 10;
   public $b = 15;
   public $c = 20;
   function _construct(){
   $this->b = $this->a * 10;
   $this->c = $this->b * 2;
   } 
   function __sleep(){
   return $this->a;
   }
  }
$k = serialize(new testSerialize1());
echo $k;

The same applies to other methods

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