A brief analysis of the use of anonymous classes in PHP7
After PHP7, the anonymous class feature was added to PHP. Anonymous classes and anonymous methods make PHP a more modern language and make our code development work more and more convenient. The following article will briefly introduce you to the usage of PHP7 anonymous classes. I hope it will be helpful to you!
Anonymous class is like a class that is not defined in advance, but is instantiated directly when it is defined.
// 直接定义
$objA = new class{
public function getName(){
echo "I'm objA";
}
};
$objA->getName();
// 方法中返回
function testA(){
return new class{
public function getName(){
echo "I'm testA's obj";
}
};
}
$objB = testA();
$objB->getName();
// 作为参数
function testB($testBobj){
echo $testBobj->getName();
}
testB(new class{
public function getName(){
echo "I'm testB's obj";
}
});// 继承、接口、访问控制等
class A{
public $propA = 'A';
public function getProp(){
echo $this->propA;
}
}
trait B{
public function getName(){
echo 'trait B';
}
}
interface C{
public function show();
}
$p4 = 'b4';
$objC = new class($p4) extends A implements C{
use B;
private $prop1 = 'b1';
protected $prop2 = 'b2';
public $prop3 = 'b3';
public function __construct($prop4){
echo $prop4;
}
public function getProp(){
parent::getProp();
echo $this->prop1, '===', $this->prop2, '===', $this->prop3, '===', $this->propA;
$this->getName();
$this->show();
}
public function show(){
echo 'show';
}
};
$objC->getProp();
// 匿名类的名称是通过引擎赋予的
var_dump(get_class($objC));
// 声明的同一个匿名类，所创建的对象都是这个类的实例
var_dump(get_class(testA()) == get_class(testA()));Static members in anonymous classes are the same as ordinary classes. Static members belong to the class rather than the instance.
// 静态变量
function testD()
{
return new class{
public static $name;
};
}
$objD1 = testD();
$objD1::$name = 'objD1';
$objD2 = testD();
$objD2::$name = 'objD2';
echo $objD1::$name;Recommended learning: "PHP Video Tutorial"
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