What are the key considerations for securely handling user credentials in PHP when accessing protected directories?

When accessing protected directories in PHP, it is crucial to securely handle user credentials to prevent unauthorized access. This can be achieved by using password hashing functions, such as password_hash() and password_verify(), to securely store and verify passwords. Additionally, it is important to use HTTPS to encrypt data transmission and to avoid storing plaintext passwords in variables or files.

// Example of securely handling user credentials in PHP when accessing protected directories

// Hash the user's password before storing it in the database
$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

// Verify the user's password during login
if (password_verify($_POST['password'], $hashed_password_from_database)) {
    // Password is correct, grant access to protected directory
} else {
    // Password is incorrect, deny access
}