creating own classes in CI - php

Question

I am trying to make a own class in CodeIgniter and therefore I have made a file in the folder
libraries
This class is called
Menu
And it contains a class to create a navigation bar for my website. this class is like
class Menu {
public function draw($menu) {
$CI =& get_instance();
$output = '';
foreach ($menu as $key => $value) {
$output .= "<li>";
if (is_array($value)) {
if (strpos($key, '|') !== false) {
$param = explode('|', $key);
$output .= anchor($param[1], $param[0]);
} else {
$output .= anchor('#', $key);
}
$output .= PHP_EOL."<ul>".PHP_EOL;
$output .= draw($value);
$output .= "</ul>".PHP_EOL."</li>".PHP_EOL;
} else {
$output .= anchor($key, $value, $CI->uri->slash_segment(1, 'leading') == $key ? 'class="active"' : '');
$output .= "</li>".PHP_EOL;
}
}
return $output;
}
}
I have put this class in my config file as autoload under libraries
$autoload['libraries'] = array('menu');
When I call the class to use it I do this
<?php
$m = new Menu();
echo $m->draw($menu);
?>
But unfortunately I get this error
Fatal error: Call to undefined function draw() in /Users/username/Sites/infinity2.0/application/libraries/Menu.php on line 22
Line 22 is $output .= draw($value);
But I don't know how to solve this I think its because of calling its own method again.. any help is welcome and appreciated. :)

Answer 1

Change
$output .= draw($value);
to
$output .= $this->draw($value);
$this refers to the current object, so if you want to recursively call draw() within itself, you need to use it to refer to it..
You might want to read the explanation from the php.net website: http://php.net/manual/en/language.oop5.basic.php