Need help extracting a number from a url or string

[e2interactive]

I need to pull out a number from a variable that I know is going to have a number between a "-" and ".php" and I need to extract that number. There could be numbers or other "-" in the string. I am extracting "-9890.php" using the code I have below, but I need to extract "9890" or whatever number falls between the "-" and ".php". Can anyone help me out?

<?php 
$filepath = "dkdkdkddd09090aeef-9890.php";

$filename = ereg("-[0-9]*.php$",$filepath, $number);

echo $number[0];
?>
 

[devinemke]

i don't actually need regex for this:

$filepath = 'dkdkdkddd09090aeef-9890.php';
$explode = explode('-', basename($filepath, '.php'));
echo end($explode);

[e2interactive]

Thanks that works good!

Now I need to be able to extract certain elements from the string.

EXAMPLE:
I have a page called bpage.php. I want to strip out the "b" from the page.php or the first character of the "bpage.php" or it could be zpage.php and I need the "z". Could you explain how to extact cetian elements from a string?

[devinemke]

$page = 'bpage.php';
echo $page{0}; // outputs "b"