Create a 2-element array by exploding only on the last occurring delimiter

$split_point = ' - ';
$string = 'this is my - string - and more';

How can I make a split using the second instance of $split_point and not the first one. Can I specify somehow a right to left search?

Basically how do I explode from right to left. I want to pick up only the last instance of " - ".

Result I need:

$item[0] = 'this is my - string';
$item[1] = 'and more';

and not:

$item[0] = 'this is my';
$item[1] = 'string - and more';