<?php class DB {
    const HOST='127.0.0.1';
    const USER='root';
    const PASS='root';
    const DATA='mooc';
    static public $_instance;
    private function __construct() {
    mysql_connect(DB::HOST,DB::USER,DB::PASS);
    mysql_set_charset('utf8');
    mysql_select_db(DB::DATA);
}
public static function getInstance() {
    if(!self::$_instance instanceof self) {
    self::$_instance=new self;
}
return self::$_instance;
}
} $model=DB::getInstance();
    //连接数据库,并且测试 $sql="select * from user";
    $res=mysql_query($sql);
    while($row=mysql_fetch_assoc($res)) {
    var_dump($row);
}
?>
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09-04 19:08