Question

我有一個問題在處理寄存器

這裏是該函數的代碼：這給了我

<?php 
include $_SERVER['DOCUMENT_ROOT']. "/config/config.php"; 
$conn = new PDO('mysql:host=' . $ip . ';dbname=' . $database, $username, $password); 

function registerUser($username, $password, $passwordagain, $email, $mcname) 
{ 
$validusername= "/^[a-z0-9]+$/"; 
$validpassword= "/^[A-Za-z0-9]+$/"; 
$validemail= "/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/"; 
$validmcname= "/^[A-Za-z0-9]+$/"; 
$error = 0; 

if(strlen($username)<4 || strlen($username)>24) 
{ 
$error = 1; 
} 
if(strlen($password)<6 || strlen($password)>24) 
{ 
$error = 1; 
} 
if(strlen($mcname)<4 || strlen($mcname)>24) 
{ 
$error = 1; 
} 
if(!preg_match($validusername, $username)) 
{ 
$error = 1; 
} 
if(!preg_match($validpassword, $password)) 
{ 
$error = 1; 
} 
if(!preg_match($validemail, $email)) 
{ 
$error = 1; 
} 
if(!preg_match($validmcname, $mcname)) 
{ 
$error = 1; 
} 
if($password != $passwordagain) 
{ 
$error = 1; 
} 
$userexistquery = $conn->query('SELECT * FROM users WHERE username=' . $username); 
$userexist = $userexistquery->fetch(); 
if(count($userexist) != 0) 
{ 
$error=1; 
echo "<div class='erroralert'>Username already exists!</div>"; 
} 
$emailexistquery = $conn->query('SELECT * FROM users WHERE email=' . $email); 
$emailexist = $emailexistquery->fetch(); 
if($emailexist != 0) 
{ 
$error=1; 
echo "<div class='erroralert'>E-mail already exists!</div>"; 
} 
if($error != 1) 
{ 
$encryptedpassword = hash('sha512', $password); 
$registeruser = $conn->query("INSERT INTO users(username, password, email, mcname) VALUES ('$username', '$encryptedpassword', '$email', '$mcname')"); 
echo "<div class='successalert'>Succesfully registred</div>"; 
} 
else 
{ 
echo "<div class='erroralert'>An error occured during registration.</div>"; 
} 
} 
?> 

的錯誤是：

Notice: Undefined variable: conn in C:\xampp\htdocs\functions\functions.php on line 45

Fatal error: Call to a member function query() on a non-object in C:\xampp\htdocs\functions\functions.php on line 45

Answer 1

你實例你的變量$conn以外的函數。您必須將其作爲參數傳遞才能在內部使用它。