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我有一个通过spl_autoload_register注册的自动加载器函数。它包含并初始化类很好，但是当涉及到我的数据库类时会出现问题。PHP：使用自动加载器导致我的数据库类失败
这是连接类（DbConnect.php）：
static $db_host = '';
static $db_user = '';
static $db_pswd = '';
static $db_name = '';
class database_DbConnect
{
private static $instance;
public $db;
/* Singleton */
public static function singleton(){
if (!isset(self::$instance)){
$c = __CLASS__;
self::$instance = new $c;
}
return self::$instance;
}
public function __clone() { trigger_error('Cloning not allowed.', E_USER_ERROR); }
public function __wakeup() { trigger_error('Unserializing is not allowed.', E_USER_ERROR); }
/* Database initialisation */
private function __construct()
{
global $db_host, $db_user, $db_pswd, $db_name;
try {
@$this->db = new mysqli($db_host, $db_user, $db_pswd, $db_name);
if(mysqli_connect_error()){
throw new Exception('Database error:' . mysqli_connect_error());
}
}
catch(Exception $e) {
print $e->getMessage();
}
$this->db->set_charset('utf8');
}
function __destruct() { $this->db->close(); }
}
和数据库类（db.php中）：
require_once('DbConnect.php');
class database_Db
{
public $db;
public $stmt = NULL;
public $error;
public function __construct(){
$DB_connect = database_DbConnect::singleton();
$this->db = $DB_connect->db;
}
function __destruct(){
if($this->stmt != NULL) $this->stmt->close();
}
function __call($func, $arg_array){
switch($func){
case 'num_rows':
if($arg_array != NULL){
$this->execute_query($arg_array);
$num_rows = $this->execute_result_info();
return $num_rows['num_rows'];
}
$result = $this->execute_num_rows();
return $result;
break;
case 'insert_id':
if($arg_array != NULL){
$this->execute_query($arg_array);
$num_rows = $this->execute_result_info();
return $num_rows['insert_id'];
}
$result = $this->execute_num_rows();
return $result;
break;
case 'query':
$this->execute_query($arg_array);
$result = $this->execute_result_array();
return $result;
break;
}
}
function __get($v){
$num_rows = $this->execute_result_info();
return $num_rows[$v];
}
private function execute_query($arg_array = NULL){
//determine the types of arguments
$sql_query=array_shift($arg_array); // the first element is returned to sql_query and then removed
$types = null;
foreach ($arg_array as $v)
{
switch ($v)
{
case is_string($v):
$types.='s';
break;
case is_int($v):
$types.='i';
break;
case is_double($v):
$types.='d';
break;
}
}
// prepare the query
print mysqli_connect_error();
$this->stmt = $this->db->prepare($sql_query);
// binding parameters if has any
try
{
$bind = null;
if (isset($arg_array[0]))
{
array_unshift($arg_array, $types);
$bind= call_user_func_array(array($this->stmt,'bind_param'),$this->makeValuesReferenced($arg_array));
}
else {
$this->has_arguments = false;
}
if ($bind)
{
$time_start=microtime(true);
$this->stmt->execute();
$this->stmt->store_result();
$time_end=microtime(true);
$time =$time_end - $time_start;
/*$this->log[]=array
(
"query" => $sql_query,
"time" => $time
); */
}
else
{
throw new Exception('Binding error:' . $this->db->error);
}
}
catch(Exception $e)
{
print $e->getMessage();
}
}
private function execute_result_info()
{
if ($this->stmt->affected_rows > 0)
{
$num_rows=$this->stmt->affected_rows;
}
else
{
$num_rows=$this->stmt->num_rows();
}
$result['num_rows'] =$num_rows;
$result['insert_id']=$this->stmt->insert_id;
return $result;
}
private function execute_result_array()
{
$result_fields = array();
$result = array();
try
{
if ($this->stmt->error)
{
throw new Exception('MySQLi STMT error:' . $this->stmt->error);
}
[email protected]$this->stmt->result_metadata();
}
catch(Exception $e)
{
print $e->getMessage();
}
if (is_object($result_metadata))
{
while ($field=$result_metadata->fetch_field())
{
array_unshift($result_fields, $field->name);
$params[]=&$row[$field->name];
}
call_user_func_array(array($this->stmt,'bind_result'),$params);
while ($this->stmt->fetch())
{
$c = array();
foreach ($row as $key => $val)
{
$c[$key]=$val;
}
$result[]=$c;
}
return $result;
}
elseif ($this->stmt->errno == 0)
{
return true;
}
else
{
return $this->stmt->errno;
}
}
private function makeValuesReferenced($arr){
$refs = array();
foreach($arr as $key => $value)
$refs[$key] = &$arr[$key];
return $refs;
}
}
初始化类工作正常，但每当我做一个数据库查询失败：
$markerQuery = "SELECT ID, lat, lng, title FROM profiles WHERE lat <> ? AND lng <> ? ";
$markerResult = $Database->query($markerQuery,'','');
我收到以下错误：
Warning: call_user_func_array() expects parameter 1 to be a valid callback, first array member is not a valid class name or object in Db.php on line 114
Binding error:No database selected
Notice: Trying to get property of non-object in Db.php on line 169