<?php
class PD
{//造对象public $dsn = "mysql:dbname=test2;host=localhost";        //数据库类型，数据库名和服务器地址public $uid="root";             //用户名public $pwd="123";             //密码/***给一个sql语句，返回执行的结果*@param string $sql 用户指定的sql语句*@param array $attr 用户指定的数组，默认为空*@param int $type 用户给的语句类型，0代表增删改，1代表查询*@return  返回查询的结果，如果是查询返回二维数组,如果是增删改返回true或false */function EXEC($sql,$attr=array(),$type=1){//造连接对象$pdo = new PDO($this->dsn,$this->uid,$this->pwd);//执行sql语句$st = $pdo->prepare($sql);//判断增、删、改、查if($type==0){return $st->execute($attr);}else if($type==1)  //从结果集对象里面取数据
        {if(!empty($attr) && count($attr)>0)  //判断是否有传过来进行查询的数组
            {$st->execute($attr);return $st->fetchAll(PDO::FETCH_ASSOC);    }    else{$st->execute();    return $st->fetchAll(PDO::FETCH_ASSOC);    }}else{return false;}}function StrEXEC($sql,$attr=array(),$type=1){//造连接对象$pdo = new PDO($this->dsn,$this->uid,$this->pwd);//执行sql语句$st = $pdo->prepare($sql);//判断增、删、改、查if($type==0){return $st->execute($attr);}else if($type==1)    //从结果集对象里面取数据
        {if(!empty($attr) && count($attr)>0)        //判断是否有传过来进行查询的数组
            {$st->execute($attr);$data = $st->fetchAll(PDO::FETCH_ASSOC);    $str="";foreach($data as $v)    //进行字符串的拼接
                {$str .= implode("^",$v);$str .="|";}return substr($str,0,strlen($str)-1);}    else{$st->execute();    $data = $st->fetchAll(PDO::FETCH_ASSOC);    $str="";foreach($data as $v){$str .= implode("^",$v);$str .="|";}return substr($str,0,strlen($str)-1);}}else{return false;}}}