问MySQL php登录

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<?php
include("mysql_functions.php");

// Check if all fields are not empty.
if (!empty($_GET['email']) && !empty($_GET['activation_token'])) {

    // MySQL database select query.
    $mysql_select_query = "SELECT * FROM Accounts WHERE email='" . $_GET['email'] . "' AND activation_token='" . $_GET['activation_token'] . "' AND activated='0' LIMIT 1";

    // Execute the MySQL database select query and check if POST password matches MySQL database hashed password.
    if(mysql_execute_query($mysql_server, $mysql_username, $mysql_password, $mysql_database_name, $mysql_select_query, false)) {
        // Valid activation link.
        // MySQL database update query.
        $mysql_update_query = "UPDATE Accounts SET activated='1' WHERE email='" . $_GET['email'] . "' AND activation_token='" . $_GET['activation_token'] . "' AND activated='0' LIMIT 1";

        // Execute the MySQL database update query to activate the account and check if it is successful.
        if (mysql_execute_query($mysql_server, $mysql_username, $mysql_password, $mysql_database_name, $mysql_update_query, false)) {
        // The account was successfully activated.
            echo $activated_message;
        } else {
            echo $not_activated_message;
        }
    } else {
        // Invalid activation link.
        echo $invalid_activation_link;
    }
} else {
    echo $not_activated_message;
}

// ------------------------ FUNCTION: MYSQL QUERY EXECUTOR -----------------------

// Function for executing MySQL queries.
function mysql_execute_query($mysql_server, $mysql_username, $mysql_password, $mysql_database_name, $mysql_query, $return_mysql_query_result_boolean) {

    // Create the MySQL database connection.
    $mysql_database_connection = mysqli_connect($mysql_server, $mysql_username, $mysql_password, $mysql_database_name);

    // Check if connected to MySQL database.
    if ($mysql_database_connection) {
        // Connected to the MySQL database.

        // Execute the MySQL query.
        if ($mysql_query_result = mysqli_query($mysql_database_connection, $mysql_query)) {
            // MySQL query has executed successfully.

            // Check if any data needs to be returned.
            if ($return_mysql_query_result_boolean) {
                // Get an associated array from the MySQL result.
                $mysql_query_result = mysqli_fetch_assoc($mysql_query_result);
            }

            // Close the MySQL database connection.
            mysqli_close($mysql_database_connection);

            // Return the MySQL query result.
            return $mysql_query_result;

        } else {
            // MySQL query has not executed successfully.
            echo "Error: " .  mysqli_error($mysql_database_connection);
            return false;
        }

    } else {
        // Could not connect to the MySQL database.
        die("Error connecting to MySQL database: " . mysqli_connect_error());
        return false;
    }
}