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<?php
    require 'PHP/thankyou.php';
    // variables for validation of contact form
    $nameError = "";
    $emailError = "";
    $name = "";
    $email = "";
    $comment = "";
    $valid = "";

    if ($_SERVER["REQUEST_METHOD"] == "POST") {
      $valid = true;
      if (empty($_POST["name"])) {
        $nameError = "Please enter a name";
        $valid = false;
      } else {
        $name = test_input($_POST["name"]);
        //checking for only letters or spaces input
        if (!preg_match("/^[a-zA-Z ]*$/", $name)) {
          $nameError = "Name can only contain letters and spaces";
          $valid = false;
        }
      }
      if (empty($_POST["email"])) {
        $emailError = "Please enter an email";
        $valid = false;
      } else {
        $email = test_input($_POST["email"]);
        //checking for correct email content
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
          $emailError = "Invalid email";
          $valid = false;
        }
      }
    }

    if (empty($_POST["comment"])) {
      $comment = "";
    } else {
      $comment = test_input($_POST["comment"]);
    }

    if ($valid) {
      submitRequest();
      exit();
    }

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




<div type="form">
              <p><span class="error">* required field.</span></p>
              <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>">
                <label>Name:
                  <input type="text" name="name">
                  <span class="error">* <?php echo $nameError;?></span>
                </label>
                <br>
                <label>Email:
                  <input type="text" name="email">
                  <span class="error">* <?php echo $emailError;?></span>
                </label>
                <br><br>
                <label>Comment:
                  <br><textarea name="comment" rows="6" cols="40"></textarea>
                </label>
                <br><br>
                <input type="submit">
                <br><br>
              </form>
            </div>