Tutorial 5 : Using an Object Interfaces

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saved as testing.php

<?php

//Define an interface that will allow conversion of objecs to strings

interface conversionOptions{

public function asString();

public function asHTML();

}

//Define a 'cat' class that implements the interface

class cat implements conversionOptions{

//Properties of a cat

public $name;

public $color;

//Constructor that requires a name

public function __construct($namesake){

$this->name=$namesake;

}

//implement the strung function of the interface

public function asString(){

return "Cat - Name:{$this->name},Color:{$this->color}";

}

//implement the HTML function of the interface

public function asHTML(){

return "<ul><li>Cat</li><ul><li>Name:{$this->name}</li>

<li>Color:{$this->color}</li></ul></ul>";

}

}

//Define class that implements the interface,for acronym definitions

class acronym implements conversionOptions{

//Properties of an acronym

private $name;

private $definition;

//Constructor that requires the term entry and definition

public function __construct($entry,$def){

$this->name=$entry;

$this->definition=$def;

}

//Implement the string function of the interface

public function asString(){

return "{$this->name}:{$this->definition}";

}

//Implementthe HTML function of the interface

public function asHTML(){

return "<dl><dt>{$this->name}</dt><dd>{$this->definition}</dd></dl>";

}

}

//Instatiate a cat & gie it data

$my_cat=new cat('Wiley');

$my_cat->color='grey tabby';

//Now return the cat as a string &echo it:

$catstring=$my_cat->asString();

echo "<pre>{$catstring}</pre>\n";

//and do the same as HTML

echo $my_cat->asHTML();

//NOW construct an acronym definition

$my_anac=new acronym('SCA','Society for Creative Anacronism');

//Covert it into string form:

$anac=$my_anac->asString();

echo "<pre>{$anac}</pre>\n";

//Now output as HTML:

echo $my_anac->asHTML();

?>

Output

Cat - Name:Wiley,Color:grey tabby

• Cat
  • Name:Wiley
  • Color:grey tabby
    

SCA:Society for Creative Anacronism

SCA

Society for Creative Anacronism




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