Zi 字媒體
2017-07-25T20:27:27+00:00
Traits 是 PHP 5.4 之後推出的功能，用來做 Mixin 的多重繼承
在進行物件導向的開發時，會把一些可以reuse的方法抽出寫成另一個類別，要使用時再繼承該類別。但當這樣子的類別一多，可能就會遇到一個類別為了特定function而不斷繼承，此時 Traits 就可以派上用場。
範例
1.基本使用
trait sayAction {
public $x = 3;
function sayHello() {
echo "Hello" . PHP_EOL;
}
function sayName($name) {
echo "My name is ${name}" . PHP_EOL;
}
}
class leagcy {
//dosomething
}
class product extends leagcy {
use sayAction;
}
$product = new product();
$product->sayHello();
$product->sayName('Johnson');
echo $product->x . PHP_EOL;
2.Parent
class leagcy {
function sayHello() {
echo 'Leagcy Hello' . PHP_EOL;
}
}
trait sayAction {
function sayHello() {
parent::sayHello();
echo "Hello" . PHP_EOL;
}
}
class product extends leagcy {
use sayAction;
}
$product = new product();
$product->sayHello();
3.同時使用多個 Trait
class leagcy {
//dosomething
}
trait sayAction {
function sayHello() {
echo "Hello" . PHP_EOL;
}
}
trait goAction {
function goDie() {
echo "Die" . PHP_EOL;
}
}
class product extends leagcy {
use sayAction,goAction;
}
$product = new product();
$product->sayHello();
$product->goDie();
4.利用Trait 繼承 Trait
class leagcy {
//dosomething
}
trait sayAction {
function sayHello() {
echo "Hello" . PHP_EOL;
}
}
trait goAction {
function goDie() {
echo "Die" . PHP_EOL;
}
}
trait execAction {
use sayAction,goAction;
}
class product extends leagcy {
use execAction;
}
$product = new product();
$product->sayHello();
$product->goDie();
5.Abstract
class leagcy {
//dosomething
}
trait sayAction {
abstract public function sayHello();
}
class product extends leagcy {
use sayAction;
function sayHello() {
echo "Hello" . PHP_EOL;
}
}
$product = new product();
$product->sayHello();
6.Static
class leagcy {
//dosomething
}
trait sayAction {
function calCount() {
static $count = 0;
$count++;
echo $count . PHP_EOL;
}
static function staticFnc() {
echo "Static" . PHP_EOL;
}
}
class product extends leagcy {
use sayAction;
}
class other {
use sayAction;
}
product::staticFnc();
$product1 = new product();
$product2 = new product();
$product1->calCount();
$product2->calCount();
$other = new other();
$other->calCount();
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