PHP Simple Factory mode sample PHP design pattern Getting Started Tutorial

/** * One case * * A farm that sells fruit to the market * There are three kinds of fruit apples and grapes on the farm. * We envision: 1, fruit has a variety of properties, each attribute is different, but they have a common place | Growing, planting, receiving, eating * 2, in the future it is possible to add new fruits, we need to define an interface to standardize the methods they must implement * 3, we need to get a class of fruit, to get a sample of a fruit from the farmer to know how to grow, grow, receive, 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 specific product classes Apple * First, we want to implement the method defined by the inherited interface * Then define the properties that are unique to Apple, and how */ Class Apple implements fruit{ The apple tree has an age Private $treeAge; Apples have color 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"; } Take the age of the apple tree Public Function Gettreeage () { return $this->treeage; } Set the age of the apple tree Public Function Settreeage ($age) { $this->treeage = $age; return trie; } } /** * Definition of specific product category grape * First, we want to implement the method defined by the inherited interface * Then define the properties specific to the grape, and the method */ Class Grape implements fruit{ Whether the grapes have seeds 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"; } There is no seed to take value Public Function getseedless () { return $this->seedless; } Set with seeds and no seeds Public Function setseedless ($seed) { $this->seedless = $seed; return true; } } /** * farmers ' classes are used to obtain instanced fruit * */ Class farmer{ Define a static factory method public static function Factory ($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; } } /** * Ways to get fruit instantiation */ try{ $appleInstance = farmer::factory (' Apple '); Var_dump ($appleInstance); }catch (Badfruitexception $err) { Echo $err->msg. "_______" . $err->errtype; } Copy Code

