php用户类(大型系统中使用的一个php用户类)

<?php
/*
* php用户类
* edit: www.jb200.com
*
*/
    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;
        }

    }
?>