随机生成密码，卡密

 //生成密码
    private function getCardPwd($num=0){
    	
    	$pwd = array();
    	for($i=0;$i<$num;$i++){
        	//生成基本随机数
        	$charid = substr(MD5(uniqid(mt_rand(), true)),8,16).$this->get_RandomString(4,'2');
            $pwd[$i]=strtoupper($charid);
    	}
    	return $pwd;
    }

 

  #创建随机字符串
    private function get_RandomString($len=4,$flag='1'){
        
        $chars= null;
        
        if($flag=='1'){
           $chars = array( "0", "1", "2","3", "4", "5", "6", "7", "8", "9" );
        }else{
           $chars = array(
             "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",
             "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",
             "w", "x", "y", "z", "0", "1", "2",
             "3", "4", "5", "6", "7", "8", "9" );
        }
        
        $charsLen = count($chars) - 1;

        shuffle($chars);    // 将数组打乱

        $output = "";

        for ($i=0; $i< $len; $i++){

            $output .= $chars[mt_rand(0, $charsLen)];
        }
        return $output;

    }

 

//生成卡号
    private function getCardId($prifix,$num=0,$length=8){
    	
    	//输出数组
    	$card = array();
    	//填补字符串
    	$pad = '';
    	
    	//日期	
    	$temp = time();
    	$Y = date('Y',$temp);
    	$M = date('m',$temp);
    	$D = date('d',$temp);
    	$TD= date('YmdHis',$temp);
    	
    	//长度
    	$LY = strlen((string)$Y);
    	$LM = strlen((string)$M);
    	$LD = strlen((string)$D);
    	$LTD = strlen((string)$TD);
    	
    	//流水号长度
    	$W = 5;

    	//根据长度生成填补字串
    	if($length<=12){
    	   $pad = $prifix.$this->get_RandomString($length - $W);
    	}else if($length>12&&$length<=16){
    	   $pad = $prifix.(string)$Y.$this->get_RandomString($length - ($LY+$W));
    	}else if($length>16&&$length<=20){
    	   $pad = $prifix.(string)$Y.(string)$M.$this->get_RandomString($length - ($LY+$LM+$W));
    	}else{
    	   $pad = $prifix.(string)$TD.$this->get_RandomString($length - ($LTD+$W));
    	}
    	
    	 //生成X位流水号
    	for($i=0;$i<$num;$i++){
    		$STR=$pad.str_pad((string)($i+1),$W,'0',STR_PAD_LEFT);
        	$card[$i] = $STR;
    	}

    	return $card;
    }