Quote from: TryNinja on December 10, 2019, 11:29:27 PM

What exactly is missing?

You already know how to verify if the address is valid. If it is, insert it into the table (as you already know), if it doesn't, do something like this:

Code:

if (!valid) {
$error = "Invalid address.";
}

// and maybe in the html
<**php if ($error) { echo $error; } **>

// i changed ? to ** since cloudflare was blocking the code with the real php tag

An working example:

Code:

<**php

if (isset($_POST["address"])) {
   $address = $_POST["address"];
   if (checkAddress($address) {
   addAddressToDb($address);
   } else {
   $error = "Invalid address.";
   }
} else {
   $error = "Please input an address.";
}

**>

   Add Address

   <**php if (isset($error)) { echo $error; } **>


// again, i changed ? to ** since cloudflare was blocking the code with the real php tag

And then, the addAddressToDb($address) function simply receives the address as a parameter and add it to the database with the INSERT sql command.

Or something like this.

this makes no sense

How are you validating if its a valid BTC address?