1
我在Windows 7中使用php和mysql的wamp服務器。有一個連接到mysql數據庫的類，db__connect文件用於建立連接。包含在一個類中的PHP訪問對象。
下面是db_connect的代碼;
<?php
include_once 'psl-config.php'; // Needed because functions.php is not included
$mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
if ($mysqli->connect_error) {
header("Location: ../error.php?err=Unable to connect to MySQL");
exit();
}下面是CLAS代碼：
<?php
include_once $_SERVER['DOCUMENT_ROOT'].'/datacentre/admin/includes/db_connect.php';
class User {
\t
\t function getPermission($email, $perms) {
\t
\t \t if ($stmt = $mysqli->prepare("SELECT members.email , groups.permission FROM members
\t \t JOIN groups ON members.group_id = groups.group_id
\t \t \t \t \t \t \t \t \t \t WHERE email = ? LIMIT 1")) {
$stmt->bind_param('s', $email); // Bind "$email" to parameter.
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
// get variables from result.
$stmt->bind_result($user_email, $user_perms);
\t \t print "yes we can ".$user_perms;
\t \t exit();
\t \t
\t \t if($perms & $user_perms)
\t \t {return true;
\t exit();}
\t
\t return false;
exit();
}
\t \t
\t }
?>下面是錯誤消息 
您在全局範圍內聲明'$ mysqli'（順便說一句壞習慣），然後嘗試在對象方法中使用它。這些是不同的範圍。 – arkascha