复制代码 代码如下:
<?php class db { private $mysqli; //数据库连接 private $options; //SQL选项 private $tableName; //表名 public function __construct($tabName) { $this->tableName = $tabName; $this->db (); } private function db() { $this->mysqli = new mysqli ( 'localhost', 'root', '', 'hdcms' ); $this->mysqli->query("SET NAMES GBK"); } public function fields($fildsArr) { if (empty ( $fildsArr )) { $this->options ['fields'] = ''; } if (is_array ( $fildsArr )) { $this->options ['fields'] = implode ( ',', $fildsArr ); } else { $this->options ['fields'] = $fildsArr; } return $this; } public function order($str) { $this->options ['order'] = "ORDER BY " . $str; return $this; } public function select() { $sql = "SELECT {$this->options['fields']} FROM {$this->tableName} {$this->options['order']}"; return $this->query ( $sql ); } private function query($sql) { $result = $this->mysqli ->query ( $sql ); $rows = array (); while ( $row = $result->fetch_assoc () ) { $rows [] = $row; } return $rows; } private function close() { $this->mysqli ->close (); } function __destruct() { $this->close (); } } $chanel = new db ( "hdw_channel" ); $chanelInfo = $chanel->fields ( 'id,cname,cpath' ) ->select (); echo "<pre>"; print_r ( $chanelInfo );
class a { protected function aa(){ echo 222; } } class b extends a{ function bb(){ $this->aa(); } } $c = new b(); $c->bb();
public 公有的：本类，子类，外部对象都可以调用 protected 受保护的：本类 子类，可以执行，外部对象不可以调用 private 私有的：只能本类执行，子类与外部对象都不可调用查看更多关于一个php初学者的一个学习笔记的面向对象编程实的详细内容...