PHP Form Validation Using empty() Function


I'm trying to learn PHP. I wanted to validate the form I have but couldn't achieve what I want.

  1. I want to validate theusername field if it's empty or not usingempty() function. But if it's false, do not display the username yet.
  2. Validate thepassword field if empty or not using the same function.
  3. What I want is to display theusername andpassword only if both fields are not empty. Here's what I have so far.

    <!DOCTYPE html>
    <title>Form Validation</title>
    $username = $password = '';
    $username_err = $password_err = '';
    if (isset($_POST['submit']))
    if (empty($_POST['username']))
    $username_err = "Username is required<br>";
    else {  
    $username = htmlspecialchars($_POST['username']);
    if (!preg_match("/^[a-zA-Z ]*$/",$username))
    $username_err = "Only letters are required<br>";
    if (empty($_POST['password']))
    $password_err = "Password is required<br>";
    else {
    $password = sha1($_POST['password']);
      <form id="form" action="<?php echo htmlspecialchars($_SERVER['PHP_SELF']); ?>"                 method="post">
      Enter your username:<input type="text" name="username" value="<?php echo $username; ?>"> 
    <span><?php echo $username_err; ?></span>
    Enter your password:<input type="password" name="password">
    <span><?php echo $password_err; ?></span>
      <input type="submit" name="submit" value="Submit">
    <?php echo $username, '<br>', $password, '<br>'; ?>

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