实现搜索框输入时 提示相近词的功能
下面是三个文件的代码 把sql文件导入到mysql数据库里 修改下数据库密码为自己的 记得哦是UTF-8编码

php+mysql+ajax实现百度搜索下拉提示框
效果图

rpc.php文件

sql数据库autoComplete.sql文件（导入到mysql）

-- phpMyAdmin SQL Dump
-- version 3.3.5
-- http://www.phpmyadmin.net
--
-- 主机: localhost
-- 生成日期: 2010 年 12 月 09 日 02:36
-- 服务器版本: 5.0.22
-- PHP 版本: 5.2.14

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

--
-- 数据库: `test`
--

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

--
-- 表的结构 `countries`
--

CREATE DATABASE test DEFAULT CHARACTER SET UTF8;CREATE TABLE IF NOT EXISTS `countries` (  `id` int(6) NOT NULL auto_increment,  `value` varchar(250) NOT NULL default '',  PRIMARY KEY  (`id`)) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=1;---- 转存表中的数据 `countries`--INSERT INTO `countries` (`id`, `value`) VALUES(1, 'Afghanistan'),(2, 'Aringland Islands'),(3, 'Albania'),(4, 'Algeria'),(5, 'American Samoa'),(6, 'Andorra'),(7, 'Angola'),(8, 'Anguilla'),(9, 'Antarctica'),(10, 'Antigua and Barbuda'),(11, 'Argentina'),(12, 'Armenia'),(13, 'Aruba'),(14, 'Australia'),(15, 'Austria'),(16, 'Azerbaijan'),(17, 'Bahamas'),(18, 'Bahrain'),(19, 'Bangladesh'),(20, 'Barbados'),(21, 'Belarus'),(22, 'Belgium'),(23, 'Belize'),(24, 'Benin'),(25, 'Bermuda'),(26, 'Bhutan'),(27, 'Bolivia'),(28, 'Bosnia and Herzegovina'),(29, 'Botswana'),(30, 'Bouvet Island'),(31, 'Brazil'),(32, 'British Indian Ocean territory'),(33, 'Brunei Darussalam'),(34, 'Bulgaria'),(35, 'Burkina Faso'),(36, 'Burundi'),(37, 'Cambodia'),(38, 'Cameroon'),(39, 'Canada'),(40, 'Cape Verde'),(41, 'Cayman Islands'),(42, 'Central African Republic'),(43, 'Chad'),(44, 'Chile'),(45, 'China'),(46, 'Christmas Island'),(47, 'Cocos (Keeling) Islands'),(48, 'Colombia'),(49, 'Comoros'),(50, 'Congo'),(51, 'Congo'),(52, ' Democratic Republic'),(53, 'Cook Islands'),(54, 'Costa Rica'),(55, 'Ivory Coast (Ivory Coast)'),(56, 'Croatia (Hrvatska)'),(57, 'Cuba'),(58, 'Cyprus'),(59, 'Czech Republic'),(60, 'Denmark'),(61, 'Djibouti'),(62, 'Dominica'),(63, 'Dominican Republic'),(64, 'East Timor'),(65, 'Ecuador'),(66, 'Egypt'),(67, 'El Salvador'),(68, 'Equatorial Guinea'),(69, 'Eritrea'),(70, 'Estonia'),(71, 'Ethiopia'),(72, 'Falkland Islands'),(73, 'Faroe Islands'),(74, 'Fiji'),(75, 'Finland'),(76, 'France'),(77, 'French Guiana'),(78, 'French Polynesia'),(79, 'French Southern Territories'),(80, 'Gabon'),(81, 'Gambia'),(82, 'Georgia'),(83, 'Germany'),(84, 'Ghana'),(85, 'Gibraltar'),(86, 'Greece'),(87, 'Greenland'),(88, 'Grenada'),(89, 'Guadeloupe'),(90, 'Guam'),(91, 'Guatemala'),(92, 'Guinea'),(93, 'Guinea-Bissau'),(94, 'Guyana'),(95, 'Haiti'),(96, 'Heard and McDonald Islands'),(97, 'Honduras'),(98, 'Hong Kong'),(99, 'Hungary'),(100, 'Iceland'),(101, 'India'),(102, 'Indonesia'),(103, 'Iran'),(104, 'Iraq'),(105, 'Ireland'),(106, 'Israel'),(107, 'Italy'),(108, 'Jamaica'),(109, 'Japan'),(110, 'Jordan'),(111, 'Kazakhstan'),(112, 'Kenya'),(113, 'Kiribati'),(114, 'Korea (north)'),(115, 'Korea (south)'),(116, 'Kuwait'),(117, 'Kyrgyzstan'),(118, 'Lao People''s Democratic Republic'),(119, 'Latvia'),(120, 'Lebanon'),(121, 'Lesotho'),(122, 'Liberia'),(123, 'Libyan Arab Jamahiriya'),(124, 'Liechtenstein'),(125, 'Lithuania'),(126, 'Luxembourg'),(127, 'Macao'),(128, 'Macedonia'),(129, 'Madagascar'),(130, 'Malawi'),(131, 'Malaysia'),(132, 'Maldives'),(133, 'Mali'),(134, 'Malta'),(135, 'Marshall Islands'),(136, 'Martinique'),(137, 'Mauritania'),(138, 'Mauritius'),(139, 'Mayotte'),(140, 'Mexico'),(141, 'Micronesia'),(142, 'Moldova'),(143, 'Monaco'),(144, 'Mongolia'),(145, 'Montserrat'),(146, 'Morocco'),(147, 'Mozambique'),(148, 'Myanmar'),(149, 'Namibia'),(150, 'Nauru'),(151, 'Nepal'),(152, 'Netherlands'),(153, 'Netherlands Antilles'),(154, 'New Caledonia'),(155, 'New Zealand'),(156, 'Nicaragua'),(157, 'Niger'),(158, 'Nigeria'),(159, 'Niue'),(160, 'Norfolk Island'),(161, 'Northern Mariana Islands'),(162, 'Norway'),(163, 'Oman'),(164, 'Pakistan'),(165, 'Palau'),(166, 'Palestinian Territories'),(167, 'Panama'),(168, 'Papua New Guinea'),(169, 'Paraguay'),(170, 'Peru'),(171, 'Philippines'),(172, 'Pitcairn'),(173, 'Poland'),(174, 'Portugal'),(175, 'Puerto Rico'),(176, 'Qatar'),(177, 'Runion'),(178, 'Romania'),(179, 'Russian Federation'),(180, 'Rwanda'),(181, 'Saint Helena'),(182, 'Saint Kitts and Nevis'),(183, 'Saint Lucia'),(184, 'Saint Pierre and Miquelon'),(185, 'Saint Vincent and the Grenadines'),(186, 'Samoa'),(187, 'San Marino'),(188, 'Sao Tome and Principe'),(189, 'Saudi Arabia'),(190, 'Senegal'),(191, 'Serbia and Montenegro'),(192, 'Seychelles'),(193, 'Sierra Leone'),(194, 'Singapore'),(195, 'Slovakia'),(196, 'Slovenia'),(197, 'Solomon Islands'),(198, 'Somalia'),(199, 'South Africa'),(200, 'South Georgia and the South Sandwich Islands'),(201, 'Spain'),(202, 'Sri Lanka'),(203, 'Sudan'),(204, 'Suriname'),(205, 'Svalbard and Jan Mayen Islands'),(206, 'Swaziland'),(207, 'Sweden'),(208, 'Switzerland'),(209, 'Syria'),(210, 'Taiwan'),(211, 'Tajikistan'),(212, 'Tanzania'),(213, 'Thailand'),(214, 'Togo'),(215, 'Tokelau'),(216, 'Tonga'),(217, 'Trinidad and Tobago'),(218, 'Tunisia'),(219, 'Turkey'),(220, 'Turkmenistan'),(221, 'Turks and Caicos Islands'),(222, 'Tuvalu'),(223, 'Uganda'),(224, 'Ukraine'),(225, 'United Arab Emirates'),(226, 'United Kingdom'),(227, 'United States of America'),(228, 'Uruguay'),(229, 'Uzbekistan'),(230, 'Vanuatu'),(231, 'Vatican City'),(232, 'Venezuela'),(233, 'Vietnam'),(234, 'Virgin Islands (British)'),(235, 'Virgin Islands (US)'),(236, 'Wallis and Futuna Islands'),(237, 'Western Sahara'),(238, 'Yemen'),(239, 'Zaire'),(240, 'Zambia'),(241, 'Zimbabwe');