<?php    class user    {        var $usertable;         function get_oneuser($field,$value)        {            $field_array=array("id","name");        //查询方式            if(in_array($field,$field_array))            {                $sql="SELECT * FROM `$this->usertable` FROM $field='$value'";                $db=new database;                $res=$db->execute($sql);                $obj_user=MySQL_fetch_object($res);                return $obj_user;            }            else    echo "查询方式不对";        }         function get_moreusers()        {            global $db;            $argnums=func_num_args();            $argarr=func_get_args();            switch($argnums)            {                case 0:                    $sql="SELECT * FROM `$this->usertable`";                    break;                case 2:                    $sql="SELECT * FROM `$this->usertable` WHERE $argarr[0]='$argarr[1]'";                    break;                case 4:                    $sql="SELECT * FROM `$this->usertable` WHERE $argarr[0]='$argarr[1]' AND $argarr[2]='$argarr[3]'";                    break;            }            //$db=new database;            $res=$this->execute($sql);            $obj_arr=array();            while($obj=mysql_fetch_object($res))            {                $obj_arr[]=$obj;            }            return $obj_arr;        }         }   ?>

　　详细说明：http://php.662p.com/thread-563-1-1.html