Just a few changes in 5.4 & 5.5 you might find interesting, some pretty cool new features.
Short array syntax
$a = [1,2,3,4];
echo $a[0];
$a = ['a' => 1, 'b' => 2];
echo $a['a'];
Function array dereferencing
function test()
{
return [1,2,3];
}
echo test()[0]; // Won't work <5.4...