How can developers ensure the security of user passwords when using MD5 hashing in PHP applications?

When using MD5 hashing in PHP applications, developers can ensure the security of user passwords by salting the passwords before hashing them. Salting involves adding a unique random string to each password before hashing, making it more difficult for attackers to crack the passwords using rainbow tables.

// Generate a random salt
$salt = uniqid(mt_rand(), true);

// Add the salt to the password before hashing
$hashed_password = md5($salt . $password);

// Store the hashed password and the salt in the database
// When verifying the password, retrieve the salt for the user and hash the input password with the salt before comparing it with the stored hashed password