[RESOLVED] Format phone number

[zzz]

I need to format phone number on the output. Currently I have it stored as:

333-444-5555
[phone]
[phone]
3334445555

I'd like to have it display [phone]

Any direction would be highly appreciated. Someone must've done this before, perhaps someone can point me to a function. Anything helps.

[zzz]

Found it:

$phone = ereg_replace("\([0-9]{3}\) [0-9]{3}-[0-9]{4}","(xxx) xxx-xxxx",$phone);
$phone = ereg_replace("[0-9]{3}-[0-9]{3}-[0-9]{4}","xxx-xxx-xxxx",$phone);
$phone = ereg_replace("1-[0-9]{3}-[0-9]{3}-[0-9]{4}","1-xxx-xxx-xxxx",$phone);
$phone = ereg_replace("[0-9]{3}-[0-9]{4}","xxx-xxxx",$phone);