What are some best practices for securely storing and comparing user passwords in a PHP login script, considering encryption methods like MD5?

To securely store and compare user passwords in a PHP login script, it is recommended to use a strong hashing algorithm like bcrypt instead of MD5. Bcrypt is a more secure option as it incorporates a salt and multiple rounds of hashing, making it harder for attackers to crack passwords. Additionally, always remember to properly sanitize and validate user input to prevent SQL injection and other security vulnerabilities. 

// Storing user password securely using bcrypt
$password = "user_password";
$hashed_password = password_hash($password, PASSWORD_BCRYPT);

// Comparing user input password with stored hashed password
$user_input_password = "user_input_password";
$stored_hashed_password = "hashed_password_from_database";

if (password_verify($user_input_password, $stored_hashed_password)) {
    // Passwords match, proceed with login
} else {
    // Passwords do not match, show error message
}

Keywords

password hashing password salting password_verify bcrypt password_hash

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