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<?php
      // Using prepared statements with PDO
      $stmt = $pdo->prepare("SELECT * FROM users WHERE username = ?");
      $stmt->execute([$username]);
      $user = $stmt->fetch();
    ?>

<?php
      $username = $_POST['username'];
      $password = $_POST['password'];
      
      // Validate and sanitize user input
      if (filter_var($username, FILTER_VALIDATE_EMAIL)) {
        // Valid email address
      } else {
        // Invalid email address
      }
      
      $username = htmlspecialchars($username);
      $password = md5($password);
    ?>

<?php
      // Enable error reporting
      error_reporting(E_ALL);
      ini_set('display_errors', 1);
      
      // Log errors to a file
      ini_set('log_errors', 1);
      ini_set('error_log', '/path/to/error.log');
    ?>

<?php
      // Storing password hashes using bcrypt
      $password = "mypassword";
      $hash = password_hash($password, PASSWORD_BCRYPT);
      
      // Verifying password against stored hash
      if (password_verify($password, $hash)) {
        // Password is correct
      } else {
        // Password is incorrect
      }
    ?>

<?php
  // Update PHP to the latest stable version
  // Check for updates from PHP's official website or repository
  
  // Update third-party libraries to the latest versions
  // Check for updates from library developers or official documentation
?>