preg_replace无法正常工作！

Question

Here's my Codeigniter function:

function edit_phone($phone)
{
            if (preg_match('/^\(?[0-9]{3}\)?[-. ]?[0-9]{3}[-. ]?[0-9]{4}$/', $phone))
            {
                return preg_replace("/([0-9]{3})([0-9]{3})([0-9]{4})/", "$1-$2-$3", $phone); 
            }
            else
            {
               $this->CI->validation->set_message('phone', "This must be a 10-digit USA phone number.");
                    return FALSE;       
            }
}

This validates/checks the input alright, but doesn't reformat it in the db.

Validation is great! But why isn't this returning a standard phone number?!

Answer 1

I think the problem is that it will ONLY work with a number in the format 1234567890, but based on the regular expression in the preg_match() call, Kevin is also looking to accommodate numbers like:

• (123)4567890
• [phone]
• 123-456-7890

If so, the regex in the preg_replace() needs to be something like...

preg_replace('/^\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})$/', "$1-$2-$3", $phone)