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Which of the following is used to pass an object?

Reference

Value as well as reference

Value

Handle

Explanation: Answer option A is correct.

An object is always passed by reference (in reality, it is passed by handle) rather than by value. An object is a living instance of a class. Hence, an object is created from the definition of the class and is loaded in memory. If you want to create an object of a PHP5 class, you can use the keyword new. Below is the syntax style of how to create objects in PHP5:

$obj_name = new ClassName();

class User {
 public $first_name, $last_name;
 public function setData($first_name, $last_name) {
 $this->first_name = $first_name;
 $this->last_name = $last_name;
 }
 public function printData() {
 echo $this->first_name . " : " . $this->last_name;
 }
} 
$u1 = new User();
$u2 = new User();
/* $u1 and $u2 are two objects of the User class. Both these objects are allocated different blocks in the memory.*/

Reference: http://in3.php.net/manual/en/language.types.object.php