7.3 PHP Constructor

• A constructor allows you to initialize an object's properties upon creation of the object.
• If you create a __construct() function, PHP will automatically call this function when you create an object from a class.
• Notice that the construct function starts with two underscores (__)!
• We see in the example below, that using a constructor saves us from calling the set_name() method which reduces the amount of code:

Example 1: PHP Constructor part 1

<?php
class Fruit {
  public $name;
  public $color;

  function __construct($name) {
    $this->name = $name;
  }
  function get_name() {
    return $this->name;
  }
}

$apple = new Fruit("Apple");
echo $apple->get_name();
?>

Another example:

Example 2: PHP Constructor part 2

<?php
class Fruit {
  public $name;
  public $color;

  function __construct($name, $color) {
    $this->name = $name;
    $this->color = $color;
  }
  function get_name() {
    return $this->name;
  }
  function get_color() {
    return $this->color;
  }
}

$apple = new Fruit("Apple", "red");
echo $apple->get_name();
echo "<br>";
echo $apple->get_color();
?>