被 PDO 中的致命错误困扰？ [关闭]

Question

我的网页收到致命错误输出。这是错误：

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致命错误：/Users/aaronwilson/Desktop/testing_server/ATOM_CMS/config/setup.php 中的消息“SQLSTATE[HY000] [2005] 未知 MySQL 服务器主机 '$host' (20)”未捕获异常 'PDOException' :14 堆栈跟踪：#0 /Users/aaronwilson/Desktop/testing_server/ATOM_CMS/config/setup.php(14): PDO->__construct('mysql:host=$hos...', 'atomcmsadmin', '**') #1 /Users/aaronwilson/Desktop/testing_server/ATOM_CMS/config/setup.php(22): dbConnect('atomcmsadmin', '**', 'localhost', 'Atom_CMS') #2 /Users/aaronwilson/Desktop/testing_server/ATOM_CMS/index.php(2): include('/Users/aaronwil...') #3 {main} 在 /Users/ 中抛出aaronwilson/Desktop/testing_server/ATOM_CMS/config/setup.php 在第 14 行

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这是在我的 Setup.php 页面上触发错误的代码：

<?php ## Setup Document

// host(or location of the database), username, password, database name
//Variables for connecting to your database.
//These variable values come from your hosting account.

error_reporting(E_ALL);
ini_set('display_errors', 1);
require('functions/sandbox.php');

$host = "localhost";
$user = "atomcmsadmin";
$pass = "*******";
$dbname = "Atom_CMS";

//Connecting to your database

function dbConnect($user, $pass, $host, $dbname) {
$dbc = new PDO('mysql:host=$host;dbname=$dbname', $user, $pass);

try {
    global $dbc;
    }
catch (PDOException $e) {
    echo $e->getMessage();
}
}
if (dbConnect($user, $pass, $host, $dbname)) {
print('worked');
}

if ($_GET ['page'] == '') {
$pg = 'home';} 
else {
$pg = $_GET ['page']; }
$page_title = get_title($dbc, $pg);
?>

任何建议将不胜感激.. :)

Answer 1

在这一行：

$dbc = new PDO('mysql:host=$host;dbname=$dbname', $user, $pass);

您使用了单引号。 PHP 不会扩展使用单引号的字符串中的变量，因此 PDO 将主机名视为 $host。

试试

$dbc = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
               ^                               ^ // note double quotes.