我開始通過觀看youtube上的教程(phpacademy)來構建oop登錄/註冊系統,我得到了一分,代碼無法工作。我檢查了幾次,仍然沒有。數據庫創建和工作很好,我有一個用戶在db(用戶)-alex。 如果有人可以看到我做錯了什麼,請幫助我:)PHP OOP登錄/註冊系統
我希望我解釋我的問題是正確的,我得到的錯誤是:「致命錯誤:調用一個非對象的成員函數count()在C:\ XAMPP \ htdocs中\ oopLogin \的index.php第7" 行
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();
}
return self::$_instance;
}
public function query($sql, $params = array()) {
$this->_error = false;
if($this->_query = $this->_pdo->prepare($sql)) {
$x = 1;
if(count($params)) {
foreach($params as $param) {
$this->_query->bindValue($x, $param);
$x++;
}
}
if($this->_query->execute()) {
$this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
}
else {
$this->_error = true;
}
}
return $this;
}
public function action($action, $table, $where = array()) {
if(count($where) === 3){
$operators = array('=', '>', '<', '>=', '<=');
$field = $where[0];
$operator = $where[1];
$value = $where[2];
if(in_array($operator, $operators)) {
$sql = "($action) FROM ($table) WHERE ($field) ($operator) ?";
if(!$this->query($sql, array($value))->error()) {
return $this;
}
}
}
return false;
}
public function get($table, $where) {
return $this->action('SELECT *', $table, $where);
}
public function delete($table, $where) {
return $this->action('DELETE', $table, $where);
}
public function results() {
return $this->_results;
}
public function error() {
return $this->_error;
}
public function count() {
return $this->_count;
}
}
的index.php
<?php
require_once 'core/init.php';
$user = DB::getInstance()->get('users', array('username', '=', 'alex'));
if(!$user->count()) {
echo 'No user';
} else {
foreach($user->results() as $user) {
echo $user->username, '<br>';
}
}
'計數()'是在'DB'類中的方法,而不是在你的結果。 – DanFromGermany 2014-09-22 10:47:30
考慮@DanFromGermany的評論是正確的。我不確定'$ sql =「($ action)FROM($ table)WHERE($ field)($ operator)?」;'因括號而工作。 – jbrtrnd 2014-09-22 10:51:41
你在你的DB類中使用return $ this,檢查$ user currectly返回,vardump($ user);之前如果幫助你!它看起來是虛假的而不是$ this – 2014-09-22 10:52:22