PHP Create Object from Class

Description

A class is defining or creating a new type. We can create variables for the new type. We call it object in object oriented programming.

Syntax

We can create an object by using the following syntax:

$aRectangleObject = new RectangleClass;

We need to use the special -> operator to reference the method.

<?PHP// w  ww  .  j  a  va2  s . co  m
class Shape {
   public function say() {
      print "shape";
   }
}

$aRectangle = new Shape;
$aRectangle->say();
?>

The code above generates the following result.

Objects Within Objects

You can use objects inside other objects. Using -> to access objects within objects. For example, we could define a NameTag class and give each Book a NameTag object like this:

<?PHP/* w ww  . j a  v  a  2  s  . c  om*/
class NameTag {
        public $Words;
}
class Book {
   public $Name;
   public $NameTag;
   public function say() {
      print "Book";
   }
}
$aBook = new Book;
$aBook->Name = "PHP";
$aBook->NameTag = new NameTag;
$aBook->NameTag->Words = "from java2s.com";
?>

The $NameTag property is declared like any other, but needs to be created with new once &aBook has been created.