echo a static varible

Some thing that may be obvious to the seasoned PHP programmer, but may surprise someone coming over from C++:

<?php
class Foo
{
$bar = 'Hi There';

public function Print(){
    echo $bar;
}
}
?>

Gives an error saying Print used undefined variable. One has to explicitly use (notice the use of<?php $this->bar ?>):

<?php
class Foo
{
$bar = 'Hi There';

public function Print(){
    echo this->$bar;
}
}
?>

<?php echo $this->bar; ?> refers to the class member, while using $barmeans using an uninitialized variable in the local context of the member function.