如何在PHP中构建安全的发送给朋友的功能？

Question

Can anyone suggest a way, or a link to an example, of building a function in PHP that allows users to send a link via e-mail to multiple friends?

Answer 1

By "secure" do you mean not allowing your form to be used to send spam?

There are a few ways to combat this:

• Don't allow the sender to enter any information. You'll just send to that list of e-mails: "such and such" suggested you check out this link. This removes the incentive from spammers.
• Captcha, force the user to fill out things to make sure it's not a robot sending spam
• Limit number of e-mails sent from the same IP