Format phone number in PHP

Users submit their phone number as part of a form. With PHP I would like to take an reasonable phone number format and convert it to:

9998887777

I think of some exceptable number formats as:

1-222-333-4444
222-333-444
222333444
(222)333-4444
(222) 333-4444
222 333-4444
1(222) 333-4444
etc...

Thanks.
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sypderAsked:
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EsopoCommented:
Hi,

You can remove all string chars from the input and see what is left, then validate the result. In your examples, by removing any non numeric char you are left with either the phone with the area code (2223334444) or the same number with the country code (12223334444).

To remove all non numeric chars from a string you can use:
 $result = ereg_replace("[^0-9]", "", $string);

Best regards,

Esopo.
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sypderAuthor Commented:
Thanks. That will work well. The one other thing I need to do is remove a leading 1, if it exists? I have not yet read my regexp book. That is going to be my reading on my flight tonight.
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star_trekCommented:
After using the above expression from Esopo
$result = ereg_replace("[^0-9]", "", $string);
use
$result = substr($result,-10); //This will trim the leading 1's
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sypderAuthor Commented:
Wow, that is obvious and simple. For some reason I was thinking complicated.
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EsopoCommented:
Are you aware that you didn't give me any points?
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sypderAuthor Commented:
I am so sorry! I (wrongfully) assumed that the two posts were both by you. I know see they were not. How can I assign points after the fact?
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EsopoCommented:
You can request assistance at Community Support:
http://www.experts-exchange.com/Community_Support/
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