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Introduction to PHP 8 Object-oriented 1 Overriding methods and properties Accessing parent classes
Introduction to PHP 8 Object-oriented 1 Overriding methods and properties Accessing parent classes
1. Subclasses cannot access the private properties and methods of the parent class
2. Overloading of methods is not supported
<?phpclass _Parent{
//子类中无法访问父类private属性 protected可以
private $data = "parent"; protected $data2 = "protected data"; public function _print()
{
echo $this->data . "<br>";
}
}class childA extends _Parent{}class childB extends _Parent{
protected $data = "childB"; // 覆盖父类的属性
// 覆盖父类的方法
public function _print()
{
echo $this->data . "<br>";
}
}class childC extends _Parent{
public function other(){
// echo $this->data; 错误 不能访问父中 private属性
echo $this->data2;
} //错误 无法重载方法 若要重写 必须参数和返回值相同
public function _print($d)
{
echo $this->data2 . $d;
}
}
$A = new childA();
$B = new childB();
$C = new childC();
$A->_print();
$B->_print();
$C->other();
//错误 PHP不支持方法的重载
$C->_print(",hi");
?>The above is PHP Introduction 8 Object Oriented 1 Methods and Properties Override Access to the Contents of the Parent Class, More Related Please pay attention to the PHP Chinese website (www.php.cn) for content!
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