Question

I have created a Page class and all the pages on my website are objects of that Page class. Each Page object has a title attribute which is passed in as an argument to the constructor and so creating a new Page object looks as follows.

<?php

require_once('library/Page.php');

$page = new Page('About');

$page->header();

This is where the problem arises.

The header() method is…

public function header()
{   

    require_once($this->templatePath . 'header.php');

}

I then echo the page title using

<?php echo $page->title; ?>

However, I get the following error.

Notice: Undefined
variable: page in
/Users/aaronfalloon/Projects/PHP/tfm/template/header.php
on line 19

Notice: Trying to get property
of non-object in
/Users/aaronfalloon/Projects/PHP/tfm/template/header.php
on line 19

Answer 1

Let me further explain about what Gumbo has written.

When you included the template file, you did the operation WITHIN the header function, thus making all $page variable in the template file referring to the local $page variable in the header function, which apparently is not declared/defined.

You should use $this->title instead to refer to the current class.

It is something like

class Page{

  public function header(){
    echo $this->title;
  }

}

when you try to include the template file:

// page class
class Page{

  public function header(){
    include('template.php');
  }

}

.

// template file
echo $this->title;