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 '
';
?>

The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

PHP object-orientedProgrammingOOP inheritance usage detailed explanation

PHP object-orientedProgrammingDetailed explanation of the definition and usage of classes

PHP object-orientedProgramming Development ideas and example analysis

The above is the detailed content of PHP object-oriented programming method example analysis. For more information, please follow other related articles on the PHP Chinese website!