<?php
  $errors = ["name"=>"", "email"=>""];
  $name = $email = "";

  if (isset($_POST["submit"])) {
    $name = $_POST["myname"];
    $email = $_POST["myemail"];

    if (!preg_match("/^[a-zA-Z]+$/", $name)) {
      $errors["name"] = "Specify a valid name.";
    }
    if (!filter_input(INPUT_POST, "myemail", FILTER_VALIDATE_EMAIL)) {
      $errors["email"] = "Specify a valid email.";
    }
  }
?>