正则表达式PHP：电话号码国际格式，+

Question

Users should enter a phone number in international format, it should always start with a +, and without any special chars, so for example +3162503277.

I thought this simple regex would do it, but somehow I must be missing something, because it doesn't accept the phone number:

if (!preg_match('/^\+?[0-9]{6}$/i', $phone)) 
    fail("Invalid phone number");

What should be the way to check if the number starts with a + and further only contains numbers?

Answer 1

Appending ? after \\+ makes + optional.

[0-9]{6}$ match only 6 digits. To match more digits, you have to use + isntead of {6} . If you want 6 or more digits, use {6,} .

Try following:

if (!preg_match('/^\+\d+$/', $phone)) 
    fail("Invalid phone number");