We can not make object of an abstract class. If we want to use it then we can inherit only. Abstract class have two condition compulsary:
1. atleast one abstract function present.
2. abstract function should be declare inside abstract class but define inside inherttence.
<?php
// Parent class
abstract class Car {
public $name;
public function __construct($name) {
$this->name = $name;
}
abstract public function intro(); // declaration only code inside child class
}
// Child classes
class Audi extends Car {
public function intro() {
return "Choose German quality! I'm an $this->name!";
}
}
class Volvo extends Car {
public function intro() {
return "Proud to be Swedish! I'm a $this->name!";
}
}
class Citroen extends Car {
public function intro() : string {
return "French extravagance! I'm a $this->name!";
}
}
// Create objects from the child classes
$audi = new audi("Audi");
echo $audi->intro();
echo "<br>";
$volvo = new volvo("Volvo");
echo $volvo->intro();
echo "<br>";
$citroen = new citroen("Citroen");
echo $citroen->intro();
?>
<?php
abstract class ParentClass {
// Abstract method with an argument
abstract protected function prefixName($name);
}
class ChildClass extends ParentClass {
// The child class may define optional arguments that are not in the parent's abstract method
public function prefixName($name, $separator = ".", $greet = "Dear") {
if ($name == "John Doe") {
$prefix = "Mr";
} elseif ($name == "Jane Doe") {
$prefix = "Mrs";
} else {
$prefix = "";
}
return "{$greet} {$prefix}{$separator} {$name}";
}
}
$class = new ChildClass;
echo $class->prefixName("John Doe");
echo "<br>";
echo $class->prefixName("Jane Doe");
?>
