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Code:

<?php
abstract
class Product {
    
private   $count;
    
private   $costStrategy;

    function
__construct( $count, CostStrategy $strategy ) {
        
$this->count = $count;
        
$this->costStrategy = $strategy;
    }

    function
cost() {
        return
$this->costStrategy->cost( $this );
    }

    function
chargeType() {
        return
$this->costStrategy->chargeType( );
    }

    function
getDuration() {
        return
$this->count;
    }
}

class
ProductOne extends Product {
}

class
ProductTwo extends Product {
}

abstract class CostStrategy {
    
abstract function cost( Product $lesson );
    
abstract function chargeType();
}

class
TimedCostStrategy extends CostStrategy {
    function
cost( Product $lesson ) {
        return (
$lesson->getDuration() * 5 );
    }
    function
chargeType() {
        return
"hourly rate";
    }
}

class
FixedCostStrategy extends CostStrategy {
    function
cost( Product $lesson ) {
        return
30;
    }

    function
chargeType() {
        return
"fixed rate";
    }
}

$lessons[] = new ProductTwo( 4, new TimedCostStrategy() );
$lessons[] = new ProductOne( 4, new FixedCostStrategy() );

foreach (
$lessons as $lesson ) {
    print
"lesson charge {$lesson->cost()}. ";
    print
"Charge type: {$lesson->chargeType()}\n";
}


?>





Author:
Mastermind
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Topic Tags

PHP OOP






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