problem with dereference marker/pointer

[Jaswinder]

can anyone clear me what is the difference between  ->    and   => ??

 

when we call method of a class, we use

 

$obj -> method();

 

can we use this also ???

 

$obj => method();

 

and also ,when we assign a value to a variable ( e.g $name ) , we us

 

$obj->name="Smith";

 

but what this means ??  $obj->$name ..    or is it incorrect  ??  or am i  assigning value of $name to $obj ??

 

i have seen a working code ... what it means

 

$obj= new name;  //name is a class
foreach($obj as $var=>$value)

 

 

 

 

[kicken]

can anyone clear me what is the difference between  ->    and   => ??

-> is used by to accesses a member of an object (function or property)

=> is used by to define a key/value pair.

 

For example:

$dtobject = new DateTime('now');  //A new datetime object
$dtobject->format('m/d/y');       //Access the format method of $dtobject and execute it.


$arr = array(                     //Define a new array
   'somekey' => 'somevalue'       //Define a key/value pair to store in that array
);

can we use this also ???

$obj => method();

No, likewise you cannot use -> in place of => when dealing with arrays.

 

but what this means ??  $obj->$name ..   

It is an application of variable-variables. What happens is PHP uses the value of $name as the name of the property to access. Eg:

 

$field = 'firstname';
$obj = new stdClass;
$obj->$field = 'kicken';
var_dump($obj->firstname); //Shows 'kicken' because the value was assigned to $obj->firstname

i have seen a working code ... what it means

 

$obj= new name;  //name is a class

foreach($obj as $var=>$value)

It loops through all the public properties of $obj and assigns them as a key/value pair to $var (property name [key]) and $value (property value [value])