Some of the PHP stuff, as others have noted with Python, etc., is misleading or outdated.

Backticks work:

    echo `ls`;

Constants can be declared globally:

    const PI = 3.14;

Anonymous functions can be declared without create_function:

    $f = function($x) { return $x*$x; }

I'm sure there are more. That said, I love these sorts of side-by-side comparisons.