How do I limit form submission rates and inputs in PHP?
<ol>
<li><p>How do I make it so people can't use an input more than once every minute?</p></li>
<li><p>How can I remove the ability to put any non-char/number characters into a submit thing? Alphabet will work and so will numbers but +,-,), etc, won't?</p></li>
</ol>
