Class and Call to a member function on a non-objec - php

Question

this time i have a hard problem. I have:
[folder] (file)
Structure directory
[class]
- (class.page.php)
- (class.main.php)
[core]
- (core.test.php)
Now class.data.php
<?php
class DataTools {
public function clean($string) {
if (!empty($string)) {
$string = addslashes($string);
$string = mysql_real_escape_string($string);
$string = (string)$string;
$string = stripslashes($string);
$string = str_replace(" ", "", $string);
$string = str_replace("(", "", $string);
$string = str_replace("=", "", $string);
return $string;
} else {
echo "Error";
die();
}
}
Now class.page.php
<?php
class Page {
public function __construct {
include "class.data.php";
$data = New DataTools();
}
?>
Now core.test.php
<?php
require_once "../class/class.page.php";
$page = new Page;
$nome = $data->clean("exemple"); // line 13
?>
When i open class.test.php it display this:
Fatal error: Call to a member function clean() on a non-object in /membri/khchapterzero/core/core.test.php on line 13( this is not important becouse i reduced the page for the topic, but the line in the original page was that i posted, the other line was comments)

Answer 1

This seems ok, if all files are in one folder it works fine, i try and there was no error. check your structures and names.
I check on:
Test->
class.data.php
class.page.php
core.test.php
in include only filename.
So checka again your paths

Answer 2

$data is defined in the Page object, it is not available as a variable in the global scope. And because you are not storing it as a class member of the Page obejct, it is also lost when Page´s constructor resolves.
To fix this:
First make $data a class member of the Page class, so that it is not discarded after the constructor is done
<?php
class Page {
public function __construct {
require_once "../include/class.data.php";
$this->data = New DataTools();
}
?>
Then, access this data variable inside the Page instead of trying to call $data directly:
$nome = $page->data->clean("exemple");