Linked list in php giving errors - php

Question

Im new to PHP and I'm trying to make a linked list but it keeps on giving errors
<?php
class Node {
private $value;
private $nxt;
function __construct($x) {
$this->value = $x;
$this->set_nxt(null);
}
function set_value($x) {
$this->value = $x;
}
function get_value() {
return $this->value;
}
function set_next($x) {
$this->nxt = $x;
}
function get_next() {
return $this->nxt;
}
}
class linked_list {
private $start = new Node(null);//error is here
function __construct() {
$start = new Node(null);
}
function add_name($nme) {
$start = new Node($nme);
if ($start->get_value() == null) {
$start = new Node(nme);
$start->set_next(null);
} else {
$temp = new Node($nme);
$temp->set_next($start);
$start = $temp;
}
}
function show_all() {
$temp = $start;
while ($temp != null) {
echo $temp->get_value();
echo "<br/>";
$temp = $temp->get_next();
}
}
}
?>
It would be great if you could tell me what I am doing wrong and how I should do it right. Please I just want to know what I am doing wrong with the PHP code. There is no need to tell me about linked list I just want to know what I am doing wrong with the implementation.
Here is the data I am working with :
$list = new linked_list();
$list->add_name("first");
$list->add_name("second");
$list->add_name("third");
$list->add_name("fourth");
$list->show_all();
and here is the error :
Basically its saying the $start in linked list class is a constant. i have commented on the place the error is coming from

Answer 1

You have at least four errors to solve:
$this->set_nxt(null); in the constructor of the Node class: set_nxt is an undefined function (maybe you meant set_next);
private $start = new Node(null); in the linked_list class: you can't declare a property and initialise it with a new instance of a class (you can do it inside the constructor);
$start = new Node(nme); in the add_name function of the linked_list class: nme is an undefined constant (maybe you meant $name);
$temp = $start; in the show_all function of the the linked_list class: $start is an undefined variable (maybe you meant $this->start).