wrapping type function...

[Beramode]

Is there a function that wraps strings after a certain amount of text, but instead of breaking onto a new line simply stops printing the rest of the string in place of ...

eg: The cat jumped onto the mat

I need a function that would wrap it to something like

The cat jumped on...

eg: wraps to nothing after 17 characters in the example.

[MUG]

substr("The cat jumped onto the mat", 0, 17);

[Beramode]

Thanks!