PHP check whether property exists in object or class

by

property_exists( mixed $class , string $property )

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

isset( mixed $var [, mixed $… ] )

NOTE : Mind that isset() will return false if property is null

if (isset($ob->a))

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

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