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phpapprentice/code/classes-constructor.php
2018-12-29 12:33:48 -06:00

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1.1 KiB
PHP

<?php
// Whenever you create an object in PHP, you put parentheses after the class name.
// In the previous examples, we always left the parentheses empty.
class Hat {
public $color;
public function setColor($color)
{
$this->color = $color;
}
}
$hat = new Hat();
// However, you can actually pass data into the parentheses like a function.
// The data will be passed to a special function on the class called a constructor.
class Ballcap
{
public $color;
public function __construct($color)
{
$this->color = $color;
}
}
// A constructor is not required, but can make creating a new object easier.
// They are usually used to define the initial value of a property.
// Instead of writing:
$hat = new Hat();
$hat->setColor('Red');
// You can write:
$ballcap = new Ballcap('Blue');
// Constructors do not return values because the return value is a always a new object.
class Tophat
{
public function __construct($color)
{
return $color;
}
}
// "$tophat" now holds an instance of Tophat, not the color "Grey".
$tophat = new Tophat('Grey');