PHP object-oriented programming method example analysis

This article mainly introduces PHP object-oriented programming methods, and combines examples with a detailed analysis of the concepts, definitions, constructors, destructors, inheritance, overloading, and interfaces of classes involved in PHP object-oriented programming. , abstract classes and other concepts and usage skills, friends in need can refer to the following

The details are as follows:

PHP5 starts to support object-oriented, the example is as follows:

"; } // 析构函数 function __destruct(){ echo '
destruct'; } // function oper1(){ echo 'oper1
'; } function oper2($param){ $this->attr1 = $param; echo $this->attr1; } protected function oper3(){ echo 'this is protected function
'; } // 禁止继承 final function oper5(){ } function __get($name){ return $this->$name; } function __set($name, $value){ $this->$name = $value; } // 静态方法 static function double($param){ return $param * $param; } } $a = new classname('First'); $b = new classname('Second'); $c = new classname(); $c->oper2("hello"); echo '
'; echo $c->attr1; echo '

'; echo ' Per-Class常量 classname::PI -'.classname::PI; echo '
静态方法: classname::double(3) - ' . classname::double(3); echo '
'; // 实现继承 echo '实现继承
'; class B extends classname{ function oper4(){ $this->oper3(); // protected方法只能在 } function oper1(){ // 重载 echo 'this is class B /'s oper1. 
'; } } $d = new B("forth"); $d->oper1(); $d->oper4(); // 接口 interface Displayable { function display(); function show(); } class C implements Displayable { function display(){ echo '这是对应接口的方法.
'; } function show(){} } $e = new C(); $e->display(); echo '检查$e是否为C的实例:'; echo ($e instanceof C) ? 'Yes':'No'; // 克隆对象 $f = clone $e; echo '

可以使用__clone()方法，在使用clone关键字时调用'; // 抽象类 abstract class E{} // $f = new E(); // 这行将报错,不能实例化抽象类 //　参数重载，多态 class F{ public $a = 1; public $b = 2; public $c = 3; function displayString($elem){ echo '
string:'.$elem; } function displayInt($elem){ echo '
int:'.$elem; } // 注意参数$p，是作为数组传入，必须使用下标访问 function __call($method, $p){ if ($method == 'display'){ if (is_string($p[0])){ $this->displayString($p[0]); } else { $this->displayInt($p[0]); } } } } $g = new F(); $g->display('abc'); // 迭代器,读出实例的所有属性 foreach ($g as $att){ echo '
'.$att; } // 反射 echo '
'; $class = new ReflectionClass('F'); echo '
'; echo $class; echo '
'; ?>
      

      

      
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