How can PHP developers ensure that MD5 hash values are stored and compared correctly in a MySQL database?

When storing MD5 hash values in a MySQL database, PHP developers should ensure that the column in the database is set to a length of 32 characters to accommodate the 32-character length of MD5 hashes. When comparing MD5 hash values, developers should retrieve the stored hash from the database and compare it to the hash of the input using the hash_equals function to prevent timing attacks.

// Storing MD5 hash value in MySQL database
$hash = md5($password);
$query = "INSERT INTO users (username, password) VALUES ('$username', '$hash')";
// Execute the query

// Comparing MD5 hash values
$stored_hash = // Retrieve stored hash from database
$input_hash = md5($input_password);

if (hash_equals($stored_hash, $input_hash)) {
    // Passwords match
} else {
    // Passwords do not match
}