Object-Oriented PHP for Beginners

Drupalers

WORKSHOP

James Candan /jɑnˈdən/

6 years PHP

4 years Drupal

 

Object-Oriented PHP for Beginners | Tuts+
DEC 23, 2011 / JASON LENGSTORF

http://code.tutsplus.com/tutorials/object-oriented-php-for-beginners--net-12762

 

@fpvraceways

Agenda

  • High level Review OOP concepts
  • Setup a remote Drupal instance
  • Quickly create a Drupal Migration module
  • Write hands-on code to grasp OOP concepts with a practical example
<?php

// Variables
$fruit = "apple";
  • Variables
  • Functions
  • Arrays/Loops
  • Logic
<?php

// Variables
$fruit = "apple";

// Logic operators
if ( $fruit == "apple" ) { 
    // can include html in string output
    echo "sweeeeeet!<br />"; 
}

// Arrays
$colors = array("blue", "purple", 'red');

// Loops
foreach ($colors as $color) {
    echo $color . "<br />";
}

<?php

// Variables
$fruit = "apple";

// Logic operators
if ( $fruit == "apple" ) { 
    // can include html in string output
    echo "sweeeeeet!<br />"; 
}

<?php

// Variables
$fruit = "apple";

// Logic operators
if ( $fruit == "apple" ) { 
    // can include html in string output
    echo "sweeeeeet!<br />"; 
}

// Arrays
$colors = array("blue", "purple", 'red');

// Loops
foreach ($colors as $color) {
    echo $color . "<br />";
}

// Functions
function color_exists($needle, $haystack) {
    return in_array($needle, $haystack);
}

// assign returned output to variable
$is_brown_good = color_exists("brown", $colors);

Prerequisites

Recognizing the Differences Between Objects and Classes

  • Classes are like blue prints
  • Objects are the actual Houses

Properties

Height

Methods

Come

Property values

Color: Gray

Eye Color: Brown

Height: 18"

Length: 36"

Weight: 30 lbs

Methods

Sit

Lay Down

Shake

Come

Create Instance

Object-Oriented Thinking
JULY 16, 2014 / RODRIGO ARAÚJO

http://www.universocomputacao.com/object-oriented-thinking/

Class

Object

Length

Weight

Eye Color

Color

Shake

Lay Down

Sit

Maximus

class RegularPolygon 
{
    protected $num_sides;
    private $radius = 1;

    public function __construct($num_sides) {
        $this->num_sides = $num_sides;
    }

    public function set_radius($radius) {
        $this->radius = $radius;
    }

    public function get_angle() {
        $sides = $this->num_sides;
        return ($sides - 2) * 180 / $sides;
    }

    public function get_side_length() {
        $radius = $this->radius;
        $sides = $this->num_sides;
        return 2*$radius*sin($M_PI/$sides);
    }

    public function get_apothem() {
        $radius = $this->radius;
        $sides = $this->num_sides;
        return $radius*cos($M_PI/$sides);
    }
}

$hexagon = new RegularPolygon(6);
echo $hexagon->get_angle(); // --> 120
class Rectangle extends RegularPolygon
{
    protected $length;
    protected $width;

    public function __construct($width, $length){
        $this->num_sides = 4;
        $this->length = length;
        $this->width = width;
    }
}
class Square extends Rectangle
{
    public function __construct($width) {
        $this->length = width;
        $this->width = width;
    }
}
$my_square = new Square();
echo $my_square->get_angle(); // --> 90

$my_hexagon = new RegularPolygon(6);
echo $my_square->get_angle(); // --> 120

Public, Protected, & Private

<?php

class Person
{
    private name;
    private mobility;

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

    public function set_name($name) {
        $this->name = $name;
    }

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

    protected function set_mobility($mobility) {
        $this->mobility = $mobility;
    }
}
<?php

class Toddler extends Person{

    public function __construct($width, $length){
        $this->mobility = 'crawling'; // <-- NOT OK.
        
        $this->set_mobility('crawling');
    }
}

$my_person = new Toddler();

// can access public elements
$my_person->set_name("Charlie");

// but accessing protected elements would be fatal
echo $my_person->mobility; // --> fatal error

?>

Summary

  • Classes are blueprints
  • Objects are actual houses
  • Classes can have Parent - Child Inheritance via "extends"
  • Visibility
    • Public - can be seen from anywhere
    • Protected - can be seen from Class & Subclass
    • Private - can ONLY be seen from within Class
    • Static - Doesn't require instantiating (Utilities)

Questions?

OOP PHP Workshop

By James Candan

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