//單例模式連接數(shù)據(jù)庫(kù)

class pzhang{

static private $instance;

private static $config;

private $dbase = array(

'host' => 'localhost',

'username' =>'root',

'password'=>'root',

'dbname' =>'jmyp'

);

private function __construct(){

}

static public function getInstance(){

if(!self::$instance instanceof self)

self::$instance = new self();

return self::$instance;

}

public function conn(){

$mysql_db = $this->dbase['dbname'];

self::$config = new mysqli($this->dbase['host'],$this->dbase['username'],$this->dbase['password']);

self::$config->query('set name utf8');

self::$config -> select_db($mysql_db);

$sql = "select * from admin";

$row = self::$config->query($sql);

$data = [];

while($tmp = $row->fetch_assoc()){

$data[] = $tmp;

}

echo "

";

print_r($data);

echo "

";

return self::$config;

}

}

$obj = pzhang::getInstance();

$obj->conn();

//單例模式對(duì)類(lèi)的引用

class zhangp{

public function system(){

echo "learning more";

}

}

class singleCase{

static private $instance;

private $avg;

private function __construct($config){

self::$instance = new $config;

}

static public function getInstance($avg){

if(!self::$instance instanceof self)

new self($avg);

return self::$instance;

}

}

$obj = singleCase::getInstance('zhangp');

$obj->system();

?>

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