Question. No. 1:
What are magic methods ?
Answer:
- __construct : called while initializing an object with a "new" keyword
- __destruct : when object is going out of scope.
- __call : When method doesn't exists or access restricted in Object scope
- __callStatic : When method doesn't exists or access restricted in Static Scope
- __get : when trying to read a variable which doesn't exist or access restricted
- __set: when trying to set a variable which doesn't exist or access restricted
- __isset : when trying to check isset a variable which doesn't exist or access restricted
- __unset : when trying to unset a variable which doesn't exist or access restricted
- __sleep : when serialize an object in order to store in database
class myClass
{
var $var1 = 3;
private $var2 = 2;
public function __sleep()
{
return array('var1', 'var2');
}
}
$myObj= new myClass;
serialize($myObj);
- __wakeup : when un-serialize an object get serialize object then un-serialize it
class myClass
{
var $var1 = 3;
private $var2 = 2;
public function __wakeup ()
{
return array('var1', 'var2');
}
}
$myObj= new myClass;
$se = serialize($myObj);
unserialize($se);
- __toString: when a class object was printed as string this method will be called
class myClass
{
public function __toString()
{
return 'class name';
}
}
$myObj = new myClass;
echo $myObj;
- __invoke : when declared ,it will be used as a callable function with instantiated object name. it takes same number of arguments passed.
class myClass
{
public function __invoke($x,$y)
{
echo $x.$y;
}
}
$myObj = new myClass;
$myObj (4,5);
- __set_state : when var_export() function called on the object
- __clone : when called clone on an object. when we try to tract the serials of cloned.
- __autoload : its not a method but Function,
