在子PHP oop中导入父函数数据

Question

I am trying to learn simple method of php oop by calling parent function data in child. However somewhere I am making mistake.

class name{
    var $firstname;
    var $lastname;
    var $name;
    public function name($firstname, $lastname){
        $this->firstname=$firstname;
        $this->lastname=$lastname;
        $this->name=$this->firstname." ".$this->lastname;
        return $this->name;
    }
}
class sentence extends name{
    var $name;
    var $letter;
    function sentence(){
        $this->letter="My name is ";
        echo $this->letter.$this->name;
    }
}
$name=new name(ABC, Xyz);
$letter=new sentence();

I have created one calls to get name input and another child class to write the sentence. However not able to call the name in child.

Answer 1

a quick fix since thats probably what you want.

<?php
class name {

private $firstname;
private $lastname;
private $name;
private $sentence;

public function __construct($firstname, $lastname){
    $this->firstname = $firstname;
    $this->lastname = $lastname;
    $this->name = $firstname . " " . $lastname;
    $this->sentence = "My name is : " . $this->name;

}

public function getName(){
    return $this->name;
}

public function getSentence(){
    return $this->sentence;
 }
}

$instance = new name("test","lastname");

echo $instance->getSentence();
?>

Answer 2

class name
{
    public $firstname;
    public $lastname;
    public $name;
    public function name($firstname, $lastname)
    {
        $this->firstname = $firstname;
        $this->lastname = $lastname;
        $this->name = $this->firstname.' '.$this->lastname;

        return $this->name;
    }
}
class sentence extends name
{
    public $name;
    public $letter;
    public function greeting()
    {
        $this->letter = 'My name is ';
        echo $this->letter.$this->name;
    }
}
//$name=new name(ABC, Xyz);
$letter = new sentence('ABC', 'Xyz');
$letter->greeting();

Thanks to @ManhNguyen

Answer 3

Are you trying to read the state of variables in a parent class?

That is not how OOP works.

You have to either group together all the variables into one class or pass it trough as an argument to the function you want to have access to the data.

Second of all you don't seem to not be using a __construct function and yet pass variables into the new name() function that is also a NO-NO.