How to insert a file in a class?

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Hi to all.

Let's say there is a class

class Box
{
	var $box_title;
	var $box_content;

	function __construct()
	{
		$this->box = '';
	}


	function box_title($title)
	{
		$this->title = $title;
	}

	function box_content($content)
	{
		$this->content = $content;
	}

	function make_box()
	{
		$this->box = '<h3>'.$this->box_title.'</h3>'.$this->box_content;
	}


	function get_box()
	{
		return $this->box;
	}
}


$box = new Box();
$box->box_title('PHP Classes');
$box->box_content('Starting with PHP 5, the object model was rewritten to allow for better performance and more features. This was a major change from PHP 4. PHP 5 has a full object model.')
$box->make_box();
echo $box->get_box();

This works fine.

The problem I have is how to "include" a file as box_content? it could be plain text, but it could be a form or some kind of code. $box->box_include(include(/path/to/file/file.php)) doesn't work, of course.

Wrapping up the whole code in a variable doesn't make a sense too:
# file.php
$content = '
	<form method="post" action="$_SERVER['PHP_SELF']">
		Email = <input type=text name=email>
		Pass = <input type=password name=pass>
		<input type=submit value=Submit>
	</form>';

# main.php
$box = new Box();
$box->box_title('PHP Classes');
include(file.php);
$box->box_content($content);
$box->make_box();
echo $box->get_box();


Also, I'm sure I read once it's not correct to print directly from a class. First return a value/result to "main" code and then print. Correct?

LAMP


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