php格式化电话号码的方法

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function format_phone($phone)

{

$phone = preg_replace("/[^0-9]/", "", $phone);

if(strlen($phone) == 7)

return preg_replace("/([0-9]{3})([0-9]{4})/", "$1-$2", $phone);

elseif(strlen($phone) == 10)

return preg_replace("/([0-9]{3})([0-9]{3})([0-9]{4})/","($1) $2-$3",$phone);

else

return $phone;

}