验证实体商业/住宅地址的正确方法是什么？

Question

Currently, I limit an address to 100 characters with no rules about what it must be composed of. Punctuation, digits, letters; all are welcome.

I use strip_tags upon saving the address to my database (prepared statements). I use $this->escape() (Zend Framework) when echoing it to a page.

I don't want to go crazy, but I think that I need to be a little more restrictive. What am I missing?

Answer 1

If these are US addresses, you should use the United States Postal Service's APIs to look up and standardize addresses.

http://www.usps.com/webtools/