php面向对象编程入门实例

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代码如下:

<?php
/*   php教程 www.512Pic.com   */

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();

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