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;
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