Page 244 - Beginning PHP 5.3

Part II: Learning the Language

public function setScreenSize( $screenSize ) {
$this- > _screenSize = $screenSize;
}

public function addStock( $numItems ) {
$this- > _stockLevel += $numItems;
}

public function sellItem() {
if ( $this- > _stockLevel > 0 ) {
$this- > _stockLevel--;
return true;
} else {
return false;
}
}

public function getStockLevel() {
return $this- > _stockLevel;
}
}

class TennisBall implements Sellable {
private $_color;
private $_ballsLeft;

public function getColor() {
return $this- > _color;
}

public function setColor( $color ) {
$this- > _color = $color;
}

public function addStock( $numItems ) {
$this- > _ballsLeft += $numItems;
}

public function sellItem() {
if ( $this- > _ballsLeft > 0 ) {
$this- > _ballsLeft--;
return true;
} else {
return false;
}
}

public function getStockLevel() {
return $this- > _ballsLeft;
}
}

class StoreManager {
private $_productList = array();

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