EmpyreanRealm/submit.php

<?php
$name = $discord = $bedrock = $birthdate = $nameErr = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = test_input($_POST["fname"]);
  if (!preg_match("/^[a-zA-Z-' ]*$/",$name)) {
    $nameErr = "Only letters and white space allowed.";
  }
  $discord = test_input($_POST["fdiscord"]);
  if (!preg_match("/.+#[0-9]{4}(?<!0000)/",$discord)) {
    $nameErr = "Discord name not valid";
  }
  $bedrock = test_input($_POST["fbedrock"]);
  if (!preg_match("/^[a-zA-Z-' ]*$/",$bedrock)) {
    $nameErr = "Only letters and white space allowed.";
  }
  $birthdate = test_input($_POST["fbirthdate"]);
} else {
    $nameErr = "Request not valid.";
}

if ($nameErr == "") {
  echo "name " . $name . "<br>";
  echo "discord " . $discord . "<br>";
  echo "bedrock " . $bedrock . "<br>";
  echo "birthday " . $birthdate  . "<br>";

  // send data somehow to db


  // end then redirect to the succes page

  header("Location: success.php");
  die();

} else {
  header("Location: index.php?error=" . htmlspecialchars($nameErr));
  die();
}

function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}
?>