CODEWITHSUNDEEP
phpisset
ORM
ORM

Reputation: 465

Will isset() trigger __get and why?

class a {
   function __get($property){...}
}

$obj = new a();
var_dump(isset($obj->newproperty));

Seems the answer is nope but why?

Upvotes: 10

Views: 2791

Answers (5)

user1735111
user1735111

Reputation: 

Class A{
   public function __get($key){
      ...
   }
   public function __set($key,$name){
      ...
   }
   public function __unset($key){
      ...
   }
   public function __isset($key){
      ...
   }
}
$obj = new A();
$get = $obj->newproperty;//$obj->__get("newproperty")
$obj->newproperty = "X";//$obj->__set("newproperty","X")
$bool = isset($obj->newproperty);//$obj->__isset("newproperty")
unset($obj->newproperty);//$obj->__unset("newproperty")

Upvotes: 0

Yacoby
Yacoby

Reputation: 55445

Because it checks __isset rather than retrieving it using __get.

It is a much better option to call __isset, as there is no standard on what is empty. Maybe in the context of the class null is an acceptable value. You could also have a class that if the member didn't exist, it returned a new empty object, which would break isset($myObj->item) as in that case it would always return true.

Upvotes: 19

andrewffff
andrewffff

Reputation: 579

It just isn't; you can use __isset instead. This is laid out here.

Upvotes: 2

Pascal MARTIN
Pascal MARTIN

Reputation: 400992

No, __get should not be triggered when you're trying to determine whether a property is set : testing if a property is set is not the same thing as trying to get its value.

Using isset triggers the __isset magic method.

See :

Upvotes: 1

David Snabel-Caunt
David Snabel-Caunt

Reputation: 58361

The magic function __get is only called when you try to access a property that doesn't exist. Checking whether a property exists is not the same as retrieving it.

Upvotes: 0

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