Backwards substr()?

[Liquid Fire]

I was wondering if there is a function that does the same thing as  substr but starts from the end so when i did substr($string, 0, 4) i would get the last four characters of the string.  I know i can do the following to get the last four characters:

<?php
$last_character = (strlen($string) - 1);
$first_character = ($last_character - 4);

$sub_string = substr($string, $first_character, $last_character);
?>

However if there is something that already does this i rather use that, if not i will just build this function into my file that has all my common functions.

[per1os]

<?php
$string = "Thelast4";
$lastfour = substr($string, -1, 4);
?>

 

www.php.net/substr

 

it can work backwards too.

[Psycho]

<?php
$string = "Thelast4";
$lastfour = substr($string, -1, 4);
?>

 

www.php.net/substr

 

it can work backwards too.

 

That wont work. This will:

 

$lastfour = substr($string, -4);

 

[obsidian]

$lastfour = substr($string, -4);

 

That's it exactly. Read the examples in the manual, and you'll see that providing a negative number for the starting point will count backwards from the end of the string.