PHP check whether property exists in object or class

Question

I understand PHP does not have a pure object variable, but I want to check whether a property is in the given object or class.

$ob = (object) array(\'a\' =&g         


        

Answer 1

property_exists( mixed $class , string $property )

if (property_exists($ob, 'a')) 

isset( mixed $var [, mixed $... ] )

if (isset($ob->a))

isset() will return false if property is null

Example 1:

$ob->a = null
var_dump(isset($ob->a)); // false

Example 2:

class Foo
{
   public $bar = null;
}

$foo = new Foo();

var_dump(property_exists($foo, 'bar')); // true
var_dump(isset($foo->bar)); // false