PHP: Last n characters to a specified character in a string?

Question

I want to get the last n characters from a string, after the last "-" character. Like:

$string = "something-123";
$substring = 123;
$string2 = "something-253672-something-21";
$substring2 = 21;

These characters can only be numbers. How can I do this with PHP? (sorry for bad english)

Answer 1

You could explode the string and parse the last element of the resulting array:

$splitted = explode("-", $string);
$numbers = end($splitted);

if (is_numeric($numbers)) {
    echo "Yay!";
} else {
    echo "Nay!";
}