PHP/Class/Method Override
Содержание
Calling an Overridden Method
<html>
<head>
<title>Calling an Overridden Method</title>
</head>
<body>
<?php
class FirstClass{
var $name = "Joe";
function FirstClass( $n ) {
$this->name = $n;
}
function sayHello() {
print "my name is $this->name<br>";
}
}
class second_class extends FirstClass {
function sayHello() {
print "calling method from parent class -- ";
FirstClass::sayHello();
}
}
$test = new second_class("sub class");
$test->sayHello();
?>
</body>
</html>
Class method override Demo
<?php
class myClass {
var $name = "A";
function myClass($n) {
$this->name = $n;
}
function sayHello() {
echo "HELLO! My name is ".$this->name;
}
}
class childClass extends myClass {
function sayHello() {
echo "I will not tell you my name.";
}
}
$object1 = new childClass("a");
$object1 -> sayHello();
?>
Method override for Rectangle class
<?php
class Rectangle {
public $height;
public $width;
public function __construct($width, $height) {
$this->width = $width;
$this->height = $height;
}
public function getArea() {
return $this->height * $this->width;
}
}
class Square extends Rectangle {
public function __construct($size) {
$this->height = $size;
$this->width = $size;
}
public function getArea() {
return pow($this->height, 2);
}
}
$obj = new Square(7);
$a = $obj->getArea();
echo "$a";
?>
The Method of a Child Class Overriding That of Its Parent
<html>
<head>
<title>The Method of a Child Class Overriding That of Its Parent</title>
</head>
<body>
<?php
class FirstClass{
var $name = "first class";
function FirstClass( $n ){
$this->name = $n;
}
function sayHello(){
print "Hello my name is $this->name<br>";
}
}
class second_class extends FirstClass {
function sayHello(){
print "say hi<br>";
}
}
$test = new second_class("new name");
$test->sayHello();
?>
</body>
</html>