Secured PHP Contact Form

<?php
  if(isset($_POST['submit'])){
    $name = htmlspecialchars(stripslashes(trim($_POST['name'])));
    $subject = htmlspecialchars(stripslashes(trim($_POST['subject'])));
    $email = htmlspecialchars(stripslashes(trim($_POST['email'])));
    $message = htmlspecialchars(stripslashes(trim($_POST['message'])));
    if(!preg_match("/^[A-Za-z .'-]+$/", $name)){
      $name_error = 'Invalid name';
    }
    if(!preg_match("/^[A-Za-z .'-]+$/", $subject)){
      $subject_error = 'Invalid subject';
    }
    if(!preg_match("/^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/", $email)){
      $email_error = 'Invalid email';
    }
    if(strlen($message) === 0){
      $message_error = 'Your message should not be empty';
    }
  }
?>

<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST">
  <label for="name">Name:</label><br>
  <input type="text" name="name">
  <p><?php if(isset($name_error)) echo $name_error; ?></p>
  <label for="subject">Subject:</label><br>
  <input type="text" name="subject">
  <p><?php if(isset($subject_error)) echo $subject_error; ?></p>
  <label for="email">Email:</label><br>
  <input type="text" name="email">
  <p><?php if(isset($email_error)) echo $email_error; ?></p>
  <label for="message">Message:</label><br>
  <textarea name="message"></textarea>
  <p><?php if(isset($message_error)) echo $message_error; ?></p>
  <input type="submit" name="submit" value="Submit">
  <?php 
    if(isset($_POST['submit']) && !isset($name_error) && !isset($subject_error) && !isset($email_error) && !isset($message_error)){
      $to = 'youremail@addres.com'; // edit here
      $body = " Name: $name\n E-mail: $email\n Message:\n $message";
      if(mail($to, $subject, $body)){
        echo '<p style="color: green">Message sent</p>';
      }else{
        echo '<p>Error occurred, please try again later</p>';
      }
    }
  ?>
</form>

Source: gist.github.com

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