Bobby_tables(PHP Form).txt

<?php
$name = "";
$character = "";
$email = "";
$birth_year = 1969;
$validation_error = "";
$existing_users = ["admin", "guest"];

if ($_SERVER["REQUEST_METHOD"] == "POST") {
  $name = trim(htmlspecialchars($_POST["name"]));
  $raw_name = htmlspecialchars($_POST["name"]);
   if(in_array($raw_name, $existing_users)) {
  $validation_error .= "This name is taken. <br>";  
 } else {
   $name = $raw_name;
 }
  $character = $_POST["character"];
  $raw_character = $_POST["character"];
  if(in_array($raw_character, ["wizard", "mage", "orc"])) {
 $character = $raw_character;
 } else {
  $validation .= "You must pick a wizard, mage, or orc. <br>";
 }
  $email = $_POST["email"];
  $raw_email = $_POST["email"];
  if(filter_var($raw_email, FILTER_VALIDATE_EMAIL)) {
    $email = $raw_email;
  } else {
    $validation_error .= "Invalid email. <br>"; 
  }
  $birth_year = $_POST["birth_year"];
  $raw_birth_year = $_POST["birth_year"];
  $options = ["options" => ["min_range" => 1900, "max_range" => date("Y")]];
 if(filter_var($raw_birth_year, FILTER_VALIDATE_INT, $options)) {
   $birth_year = $raw_birth_year;
 } else {
   $validation_error .= "That can't be your birth year. <br>";
 }
}
?>
<h1>Create your profile</h1>
<form method="post" action="">
<p>
Select a name: <input type="text" name="name" value="<?php echo $name;?>" >
</p>
<p>
Select a character:
  <input type="radio" name="character" value="wizard" <?php echo ($character=='wizard')?'checked':'' ?>> Wizard
  <input type="radio" name="character" value="mage" <?php echo ($character=='mage')?'checked':'' ?>> Mage
  <input type="radio" name="character" value="orc" <?php echo ($character=='orc')?'checked':'' ?>> Orc
</p>
<p>
Enter an email:
<input type="text" name="email" value="<?php echo $email;?>" >
</p>
<p>
Enter your birth year:
<input type="text" name="birth_year" value="<?php echo $birth_year;?>">
</p>
<p>
  <span style="color:blue;"><?= $validation_error;?></span>
</p>
<input type="submit" value="Submit">
</form>
  
<h2>Preview:</h2>
<p>
  Name: <?=$name;?>
</p>
<p>
  Character Type: <?=$character;?>
</p>
<p>
  Email: <?=$email;?>
</p>
<p>
  Age: <?=date("Y")-$birth_year;?>
</p>