PHP implementation only retains the latest 1000 records in mysql, mysql1000_PHP tutorial

php implementation only retains the latest 1000 records in mysql, mysql1000

<&#63;php 
mysql_connect("localhost","root","root");
mysql_select_db("test");
//保留最新的1000条记录
$limit=1000;
$query="select `id` from `news`";
$result=mysql_query($query);
$num=mysql_num_rows($result);
if($num>$limit){
$query="select `id` from `news` order by `id` desc limit ".$limit;
$result=mysql_query($query);
mysql_data_seek($result,$limit-1);
$data=mysql_fetch_array($result);
$query="delete from `news` where `id`<'$data[id]'";
if(mysql_query($query)){
echo "数据库中原有".$num."条记录，多余的".($num-$limit)."条记录被成功删除，现在还剩余".$limit."条记录！";
}
}else{
echo "数据记录不足".$limit."条！没有必要删除！";
}
&#63;>

test.sql

-- phpMyAdmin SQL Dump
-- version 3.1.5-rc1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generated date: August 19, 2010 05:47
-- Server version: 5.0.18
-- PHP version: 5.2.8

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

--
-- Database: `test`
--

-------------------------------------------------- ----------

--
-- Table structure `news`
--

CREATE TABLE IF NOT EXISTS `news` (
`id` int(11) unsigned NOT NULL auto_increment,
`title` varchar(256) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=gb2312;

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