如何將MySQLi轉換爲預準備語句？

Question

我對PHP/MySQL很陌生，所以請理解，但是我試圖在我的站點中實現一個複雜的登錄系統。到目前爲止，我已經完成了註冊，但是沒有使用準備好的語句來完成註冊，而只是使用了MySQLi。 由於有必要防止SQL注入，我需要以某種方式將此代碼更改爲預準備語句;我已經試過無情的時間，只是在執行語句時失敗。

這是初始工作（但未準備好）的代碼。由於這可能是一個很大的問題，我很樂意向任何人支付一小筆費用。

//Declaring variables as whitespace so nothing will be displayed below the form until submission. 
$fe_firstName = " "; 
$fe_lastName = " "; 
$fe_email = " "; 
$fe_emailconf = " "; 
$fe_username = " "; 
$fe_pw = " "; 
$fe_pwconf = " "; 
$fe_terms = " "; 
$fe_usernameInvalid = " "; 
$fe_emailInvalid = " "; 
//Declaring verification variables to ensure duplicate users aren't created. 
$verifyUsername = $_POST['username']; 
$verifyEmail = $_POST['email']; 

//Setting up array, if zero errors occur the array will stay empty. 
$errors = array(); 


//The URL of the signup page. 
//The full URL of the page the form was submitted from. 
$current = 'http://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; 
$referrer = $_SERVER['HTTP_REFERER']; 

//Ensure form comes from VAL website. 
if ($referrer == $current) { 

if($_SERVER['REQUEST_METHOD'] == 'POST'){ 
/** 
    * Validate forms 
    * Match regex 
    * Ensure pass & email confirmations match 
    */ 
    if(0 === preg_match("/^[a-z\-]{2,20}$/i", $_POST['firstName'])){ 
     $errors['e_firstName'] = "Your first name cannot be empty."; 
     $fe_firstName = "Your first name cannot be empty."; 
    } 
    if(0 === preg_match("/^[a-z\-]{2,20}$/i", $_POST['lastName'])){ 
     $errors['e_lastName'] = "Your last name cannot be empty."; 
     $fe_lastName = "Your last name cannot be empty."; 
    } 
    if(0 === preg_match("/^[a-zA-Z0-9]+[a-zA-Z0-9_.-]+[a-zA-Z0-9_-]+@[a-zA-Z0-9]+[a-zA-Z0-9.-]+[a-zA-Z0-9]+.[a-z]{2,4}$/", $_POST['email'])){ 
     $errors['e_email'] = "Please enter a valid E-Mail address."; 
     $fe_email = "Please enter a valid E-Mail address."; 
    } 
    if(0 !== strcmp($_POST['email'], $_POST['emailconf'])){ 
     $errors['e_emailconf'] = "Please ensure your E-Mail addresses match."; 
     $fe_emailconf = "Please ensure your E-Mail addresses match."; 
    } 
    if(0 === preg_match("/^[a-z\d_]{3,20}$/i", $_POST['username'])){ 
     $errors['e_username'] = "Please enter a valid username."; 
     $fe_username = "Please enter a valid username."; 
    } 
    if(0 === preg_match("/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,56}$/", $_POST['pw'])){ 
     $errors['e_pw'] = "Please follow the password instructions. You must have at least one number, one lower-case, and one upper-case letter."; 
     $fe_pw = "Please follow the password instructions. You must have at least one number, one lower-case, and one upper-case letter."; 
    } 
    if(0 !== strcmp($_POST['pw'], $_POST['pwconf'])){ 
     $errors['e_pwconf'] = "Please ensure your passwords match."; 
     $fe_pwconf = "Please ensure your passwords match."; 
    } 
    if(!isset($_POST['terms'])){ 
     $errors['e_terms'] = "You must accept the Terms and Conditions."; 
     $fe_terms = "You must accept the Terms and Conditions."; 
    } 
/** 
    * Check if username and email address already exist. 
    * If so, add error to validity array. 
    */ 
    $usernameCheck = mysqli_query($con, "SELECT * FROM users WHERE username='".$verifyUsername."'"); 
    if($usernameCheck->num_rows){ 
     $errors['e_usernameInvalid'] = "Username already exists."; 
     $fe_usernameInvalid = "Username already exists."; 
    } 
    $emailCheck = mysqli_query($con, "SELECT * FROM users WHERE email='".$verifyEmail."'"); 
    if($emailCheck->num_rows){ 
     $errors['e_emailInvalid'] = "Email already exists."; 
     $fe_emailInvalid = "Email already exists."; 
    } 

    //If no validation errors 
    if(0 === count($errors)){ 
    /*** 
     * Sanitize code 
     * Clean dangerous chars for DB 
     */ 
     $send_firstName = mysqli_real_escape_string($con, $_POST['firstName']); 
     $send_lastName = mysqli_real_escape_string($con, $_POST['lastName']); 
     $send_email = mysqli_real_escape_string($con, $_POST['email']); 
     $send_username = mysqli_real_escape_string($con, $_POST['username']); 
     $password = mysqli_real_escape_string($con, $_POST['pw']); 
     //HASH & ready password 
     // 
     // Instantiate new instance of class 
     $hash_password = new Hash_Password(); 
     // Hash the password 
     $hash = $hash_password->hash($password); 
     $send_pw = $hash; 
     //Autoset non-user-input values to 0 
    $send_wins = 0; 
    $send_losses = 0; 
    $send_played = 0; 
    $send_earnings = 0; 
     //Obtain time of form submission = Time registered. 
     $datum = new DateTime(); 
     $send_regDate = $datum->format('Y-m-d H:i:s'); 
     $send_lastLogin = $send_regDate; 
     $send_rolePermissions = 0; 

     //Insert query time. 
    $sql = " 
    INSERT INTO users (first_name, last_name, username, password, email, last_login, date_joined, wins, losses, played, earnings, permissions) VALUES 
    ('{$send_firstName}','{$send_lastName}','{$send_username}','{$send_pw}','{$send_email}','{$send_lastLogin}','{$send_regDate}','{$send_wins}','{$send_losses}','{$send_played}','{$send_earnings}','{$send_rolePermissions}') 
    "; 

     //Redirecting based on the connection result. 
    if(!mysqli_query($con, $sql)){ 
      if (!headers_sent()) { 
       exit(header("Location: registration_fail.php")); 
      } else{ 
       ?> 
      <script> location.replace("registration_fail.php"); </script> 
       <?php 
      } 
    } else{ 
      if (!headers_sent()) { 
       exit(header("Location: registration_success.php")); 
      } else{ 
       ?> 
      <script> location.replace("registration_success.php"); </script> 
       <?php 
      } 
      mysqli_close($con); 
    } 

    } 

} 
} 

很多代碼是驗證，並且「fe_」變量在表單下面回顯。我相信所有需要改變的是$ sql變量，real_escape_strings和$ usernameCheck和$ emailCheck。

再一次，我對這個不整潔的問題表示最大的歉意，但我在其他地方找不到答案。 P.S - 數據庫通過PDO連接，沒有問題。

Answer 1

您實現了服務器端驗證，這對初學者來說非常好。

PHP準備的語句非常非常簡單，php.net是這方面的資源。

我剛剛實現了PHP PDO。您可以檢查並查看GitHub的代碼。