我关注了phpacademy.org上的一系列视频,(https://www.youtube.com/watch?v=PaBWDOBFxDc&index=9&list=PLfdtiltiRHWF5Rhuk7k4UAU1_yLAZzhWc)
在上面的视频中,关注后,我收到此错误
致命错误:在D:\ xampp \ htdocs \ scorpio中的非对象上调用成员函数query()以在第4行执行\ index.php
我的代码是: 的index.php:
<?php
require_once 'core/init.php';
db::getInstance()->query("SELECT * FROM gebruikers");
?>
init.php:
<?php
session_start();
$GLOBALS['config'] = array(
'mysql' => array(
'host' => 'localhost',
'username' => 'root',
'password' => '',
'db' => 'scorpiodb'
),
'remember' => array(
'cookie_name' => 'hash',
'cookie_expiry' => 604800
),
'session' => array(
'session_name' => 'user'
)
);
spl_autoload_register(function($class){
require_once 'classes/' . $class . '.php';
});
require_once 'functions/sanitize.php';
?>
db.php中:
<?php
class db{
private static $_instance = null;
private $_pdo,
$_query,
$_error = false,
$_results,
$_count = 0;
private function __construct(){
try{
$this->_pdo = new PDO('mysql:host='. config::get('mysql/host') .';dbname='. config::get('mysql/db'), config::get('mysql/username'), config::get('mysql/password'));
} catch(PDOException $e){
die($e->getMessage());
}
}
public static function getInstance(){
if(!isset(self::$_instance)){
self::$_instance = new db();
}
}
public function query($sql, $params = array()){
$this->_error = false;
if($this->_query = $this->_pdo->prepare($sql)){
echo 'ok';
}
}
}
?>
在我将第4行包含在index和db中的查询函数之前,一切正常。也许我做的打字错误或我忽略的东西。你能帮帮我吗?