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我正在創建一個面向對象的登錄,這是我的數據庫類頁面。致命錯誤:未捕獲錯誤:調用成員函數prepare()null在文件位置
<?php
class DB {
private static $_instance = null;
private $_pdo,
$_query,
$_error= false,
$_results,
$_count = 0;
public 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'));
echo 'Connected';
} catch(PDOException $e){
die($e->getMessage());
}
}
public static function getInstance(){
if(!isset(self::$_instance)){
self::$_instance = new DB();
}
return self::$_instance;
}
public function query($sql, $params =array()){
$this->_error = false;
if($this->_query=$this->_pdo->prepare($sql)){
echo 'Success';
}
}
}
?>
這是我用來測試程序接受查詢的能力的索引頁。當我嘗試運行此頁時出現此錯誤
致命錯誤:未捕獲錯誤:調用成員函數prepare()在C:\ xampp \ htdocs \ objectorientedlogin \ classes \ DB.php中爲null:36堆棧跟蹤:#0 C:\ xampp \ htdocs \ objectorientedlogin \ index.php(4):DB-> query('SELECT username ...')#1 {main}拋出C:\ xampp \ htdocs \ objectorientedlogin \ classes \ db.php中上線36
<?php
require_once 'core/init.php';
DB::getInstance()->query("SELECT username FROM users");
?>
這是對每一個加載的類自動加載我的init.php頁。
<?php
session_start();
$GLOBALS['config']= array(
'mysql'=> array(
'host'=>'127.0.0.1',
'username'=> 'root',
'password'=>'',
'db'=>'oop_login'
),
'remember'=>array(
'cookie_name'=>'hash',
'cookie_expiry'=>604800
),
'session'=> array(
'session_name'=> 'user'
),
);
spl_autoload_register(function($class){
require_once 'classes/'.$class.'.php';
});
require_once 'functions/sanitize.php';
?>
這是我的配置頁面
<?php
Class Config{
public static function get($path=null){
if($path){
$config = $GLOBALS['config'];
$path = explode('/',$path);
foreach($path as $bit){
if(isset($config[$bit])){
$config = $config[$bit];
}
}
return $config;
}
}
}
?>
因爲,這是一個錯字'_construct' - 缺少下劃線=>'__construct' –
感謝@弗雷德-II- – ted23