How can developers ensure the security of user data in PHP applications, especially when dealing with login credentials and sensitive information?

Developers can ensure the security of user data in PHP applications by using secure hashing algorithms like bcrypt to store passwords, implementing HTTPS for secure data transmission, and validating and sanitizing user input to prevent SQL injection attacks. 

// Example of securely hashing a password using bcrypt
$password = "secret_password";
$hashed_password = password_hash($password, PASSWORD_BCRYPT);

// Example of verifying a password
$entered_password = "secret_password";
if (password_verify($entered_password, $hashed_password)) {
    echo "Password is correct";
} else {
    echo "Password is incorrect";
}

Keywords

SQL injection password hashing SSL/TLS cross-site scripting input validation

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