Description:
------------
When creating a normal function inside a class and calling it, the function doesn't have access to $this.
"Fatal error: Using $this when not in object context"

When creating a lambda function inside a class, $this is visible from the new function's scope and can be accessed normally.

Wouldn't it be better (and maybe safer) to allow the use of $this as a closure instead of passing it to the new lambda function?
Currently trying to use $this as a closure dies with a "Fatal error: Cannot use $this as lexical variable" error.

Example for the suggestion.
$x = function () use ($this) { return $this->hello; };

Reproduce code:
---------------
<?php

class something
{
	public $hello = 'Hello world!';
	
	public function world()
	{
		$x = function () { return $this->hello; };		
		return $x();
	}
}

$s = new something();
echo $s->world();

?>

Expected result:
----------------
Not to be able to use $this.