一文详解PHP实现简单的搜索功能
本篇文章给大家带来了关于PHP的相关知识，其中主要介绍了怎么用PHP做一个简单的搜索功能，感兴趣的朋友下面一起来看一下吧，希望对大家有帮助。
用PHP做一个简单的搜索功能
说到搜索，大家最熟悉不过了。当你想知道某个东西，某件事，你也许会刻意搜索它，而搜索作为一项基本的用户必备工具，它有着庞大的知识库，通过各种联动技术，当你输入想要了解的关键字时，它基本能为你展现所要搜索的结果，其实，你的一次搜索行为，搜索服务器就会发生一次头脑风暴，将关键字所匹配的多种结果一一展现出来。
开发环境：php5+mysql5+nginx1.16
数据库关键表设计
name字段用于存放搜索关键字的多种可能词汇，href字段用于存放网站地址，实现对查询结果的网站跳转，img字段则存放该网站的logo或者重要图片提示信息。
图片资源存放在项目img/search_img文件夹目录下
网站主页代码
一级搜索框代码，将参数传递给chksearch.php
二级搜索框代码，处理一级搜索传递的关键字并保存，同时支持再次搜索关键字。
一级搜索样式表
二级搜索样式表
设计代码已写完，来看看效果。
打开一级搜索页面，代码设计需要考虑三种情况1.没有输入关键字，2.输入关键字，数据库查询有结果，3.输入关键字，数据库查询无结果。先不输入关键字，直接点搜索。
自动跳转到二级搜索页面，并准确检测并提示未输入关键字，
输入“电脑”关键字，正确查询数据库name字段里含有“电脑”的结果，并以文字和图片以列表形式展示。
输入“地铁”关键字，系统提示“未找到该关键字所属内容”，确实，数据库插入数据时并无“地铁”这个词汇。
回到一级搜索，输入“google”关键字，点击搜索。
自动跳转到二级搜索页面，并保留一级搜索页面传递过来的关键字，同时也能准确查询关键字相关的结果。
测试关键字“手机”，正确展示结果。
测试关键字“空调”，正确展示结果。
测试关键字“咖啡”，正确展示结果。
测试关键字“导航”，正确展示结果。
测试关键字“腾讯”，正确展示结果。
再次输入关键字“手机”，并点击文字链接。
成功以一个新窗口跳转到关键字所属的网站。
当我们想在搜索结果中高亮显示关键字，可以在chksearch.pho文件加入str_ireplace函数。
搜索“电脑”即可以红色标记关键字。
搜索Apple
再次搜索Apple
从搜索结果可以看出并不区分关键字的英文大小写，同时也能准确标记结果集中的关键字。
当然我用的where 字段 like “%关键字%”这个sql语句实现搜索功能，有一个bug就是当输入%时，会查询所有结果，这是在用户端不被允许的，我们可以在chksearch.php做一个用户输入关键字的字符串检测，过滤掉一些非法字符。
PHP实现一个简单的搜索功能到此就演示完毕了，感谢您的阅读。
推荐学习：《PHP视频教程》
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