Description:
------------
"The behaviour of functions with by-reference parameters called by value has changed. Where previously the function would accept the by-value argument, a warning is now emitted and all by-ref parameters are set to NULL."

I find this ambiguous/difficult to understand.

"The behaviour of functions with by-reference parameters..."

Ok. This is a function "with by-reference parameters..."

<?php
function a( &$param ){
}
?>

"..called by value has changed. Where previously the function would accept the by-value argument"

Ok. This is "would accept the by-value argument..."
<?php
a(2); //2 is a literal
?>
But this is illegal even in 5.2.

So, I suppose this what is meant by "..called by value..."
<?php
a($someVariable);
?>

"a warning is now emitted and all by-ref parameters are set to NULL"

So, this would cause a warning, and all by-ref paramaters are set to NULL?

Thanks