PHP simple factory pattern example PHP design pattern introductory tutorial-PHP Tutorial-php.cn

/**
* An example
*
* A farm wants to sell fruits to the market
* There are three kinds of fruits on the farm, apples and grapes
* We imagine: 1. Fruits have many attributes, and each attribute is different, but they have Common place | Growing, planting, receiving, eating
* 2. New fruits may be added in the future. We need to define an interface to standardize the methods they must implement
* 3. We need to obtain the class of a certain fruit, You need to get examples of a certain fruit from the farmer to know how to grow, plant, harvest and eat
*/
/**
* Virtual product interface class
* Define the methods that need to be implemented
*/
interface fruit{
/**
*Growth
*/
public function grow();
/**
*Planting
*/
public function plant();
/**
* Harvest
*/
public function harvest();
/**
* Eat
*/
public function eat();
}
/**
* Define the specific product category Apple
* First, we need to implement the methods defined by the inherited interface
* Then define Apple-specific attributes and methods
*/
class apple implements fruit{
//苹果树有年龄
private $treeAge;
//苹果有颜色
private $color;
public function grow(){
echo "grape grow";
}
public function plant(){
echo "grape plant";
}
public function harvest(){
echo "grape harvest";
}
public function eat(){
echo "grape eat";
}
//取苹果树的年龄
public function getTreeAge(){
return $this->treeAge;
}
//设置苹果树的年龄
public function setTreeAge($age){
$this->treeAge = $age;
return trie;
}
}
/**
* Define the specific product class Grape
* First, we need to implement the methods defined by the inherited interface
* Then define the unique attributes and methods of Grape
*/
class grape implements fruit{
//葡萄是否有籽
private $seedLess;
public function grow(){
echo "apple grow";
}
public function plant(){
echo "apple plant";
}
public function harvest(){
echo "apple harvest";
}
public function eat(){
echo "apple eat";
}
//有无籽取值
public function getSeedLess(){
return $this->seedLess;
}
//设置有籽无籽
public function setSeedLess($seed){
$this->seedLess = $seed;
return true;
}
}
/**
*Farmer class is used to obtain instantiated fruits
*
*/
class farmer{
//定义个静态工厂方法
public static function factory($fruitName){
switch ($fruitName) {
case 'apple':
return new apple();
break;
case 'grape':
return new grape();
break;
default:
throw new badFruitException("Error no the fruit", 1);
break;
}
}
}
class badFruitException extends Exception{
public $msg;
public $errType;
public function __construct($msg = '' , $errType = 1){
$this->msg = $msg;
$this->errType = $errType;
}
}
/**
* Method to obtain fruit instantiation
*/
try{
$appleInstance = farmer::factory('apple');
var_dump($appleInstance);
}catch(badFruitException $err){
echo $err->msg . "_______" . $err->errType;
}

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PHP simple factory pattern example PHP design pattern introductory tutorial