项目结构：
开始搜索： 这里搜索关键字("大""这")
搜索结果： 高亮显示
项目所需数据库结构：
立即学习“PHP免费学习笔记（深入）”；
实现代码：
conn.php
<ol class="dp-c"><li class="alt"><span><span><?php </span></span></li><li class="alt"><span class="vars">$conn</span><span> = @ mysql_connect(</span><span class="string">"localhost"</span><span>, </span><span class="string">"root"</span><span>, </span><span class="string">""</span><span>) </span><span class="keyword">or</span><span> </span><span class="keyword">die</span><span>(</span><span class="string">"数据库链接错误"</span><span>); </span></li><li><span>mysql_select_db(</span><span class="string">"form"</span><span>, </span><span class="vars">$conn</span><span>); </span></li><li class="alt"><span>mysql_query(</span><span class="string">"set names 'gbk'"</span><span>); </span></li><li><span>?> </span></li></ol>
searchAndDisplayWithColor.php
<ol class="dp-c"><li class="alt"><span><span><?php </span></span></li><li><span class="keyword">include</span><span> </span><span class="string">'conn.php'</span><span>; </span></li><li class="alt"><span>?> </span></li><li><span><table width=500 align=</span><span class="string">"center"</span><span>> </span></li><li class="alt"><span> <form action=</span><span class="string">""</span><span> method=</span><span class="string">"get"</span><span>> </span></li><li><span> <tr> </span></li><li class="alt"><span> <td>关键字：<input type=</span><span class="string">"text"</span><span> name=</span><span class="string">"keyWord"</span><span> /> </span></li><li><span> <input type=</span><span class="string">"submit"</span><span> value=</span><span class="string">"搜索"</span><span> /></td> </span></li><li class="alt"><span> </tr> </span></li><li><span> </form> </span></li><li class="alt"><span> </table> </span></li><li><span> </span></li><li class="alt"><span> <table width=500 border=</span><span class="string">"0"</span><span> align=</span><span class="string">"center"</span><span> cellpadding=</span><span class="string">"5"</span><span> </span></li><li><span> cellspacing=</span><span class="string">"1"</span><span> bgcolor=</span><span class="string">"#add3ef"</span><span>> </span></li><li class="alt"><span> <?php </span></li><li><span> </span><span class="comment">//关键字不为空的时候才执行相关搜索 </span><span> </span></li><li class="alt"><span> </span><span class="keyword">if</span><span>(</span><span class="vars">$_GET</span><span>[</span><span class="string">'keyWord'</span><span>]){ </span></li><li><span> </span><span class="comment">//用空格符把关键字分割开 </span><span> </span></li><li class="alt"><span> </span><span class="vars">$key</span><span>=</span><span class="func">explode</span><span>(</span><span class="string">' '</span><span>, </span><span class="vars">$_GET</span><span>[keyWord]); </span></li><li><span> </span><span class="vars">$sql</span><span>=</span><span class="string">"select * from message where title like '$key[0]' or title like '$key[1]' or content like '$key[0]' or content like '%$key[1]%'"</span><span>; </span></li><li class="alt"><span> </span><span class="vars">$query</span><span>=mysql_query(</span><span class="vars">$sql</span><span>); </span></li><li><span> </span><span class="keyword">while</span><span> (</span><span class="vars">$row</span><span>=mysql_fetch_array(</span><span class="vars">$query</span><span>)){ </span></li><li class="alt"><span> </span><span class="comment">//替换关键字，并且把关键字高亮显示 </span><span> </span></li><li><span> </span><span class="vars">$row</span><span>[title]=preg_replace(</span><span class="string">"/$key[0]/i"</span><span>, </span><span class="string">"<font color=red><b>$key[0]</b></font>"</span><span>, </span><span class="vars">$row</span><span>[title]); </span></li><li class="alt"><span> </span><span class="vars">$row</span><span>[title]=preg_replace(</span><span class="string">"/$key[0]/i"</span><span>, </span><span class="string">"<font color=red><b>$key[1]</b></font>"</span><span>, </span><span class="vars">$row</span><span>[title]); </span></li><li><span> </span><span class="vars">$row</span><span>[content]=preg_replace(</span><span class="string">"/$key[0]/i"</span><span>, </span><span class="string">"<font color=red><b>$key[0]</b></font>"</span><span>, </span><span class="vars">$row</span><span>[content]); </span></li><li class="alt"><span> </span><span class="vars">$row</span><span>[content]=preg_replace(</span><span class="string">"/$key[1]/i"</span><span>, </span><span class="string">"<font color=red><b>$key[1]</b></font>"</span><span>, </span><span class="vars">$row</span><span>[content]); </span></li><li><span> ?> </span></li><li class="alt"><span> </span></li><li><span> <tr bgcolor=</span><span class="string">"#eff3ff"</span><span>> </span></li><li class="alt"><span> <td>标题：<font color=</span><span class="string">"black"</span><span>><?=</span><span class="vars">$row</span><span>[title]?></font> 用户：<font color=</span><span class="string">"black"</span><span>><?=</span><span class="vars">$row</span><span>[user] ?></font> </span></li><li><span> <div align=</span><span class="string">"right"</span><span>><a href=</span><span class="string">"preEdit.php?id=<?=$row[id]?>"</span><span>>编辑</a> | <a </span></li><li class="alt"><span> href=</span><span class="string">"delete.php?id=<?=$row[id]?>"</span><span>>删除</a></div> </span></li><li><span> </td> </span></li><li class="alt"><span> </tr> </span></li><li><span> <tr bgColor=</span><span class="string">"#ffffff"</span><span>> </span></li><li class="alt"><span> <td>内容：<?=</span><span class="vars">$row</span><span>[content]?></td> </span></li><li><span> </tr> </span></li><li class="alt"><span> <tr bgColor=</span><span class="string">"#ffffff"</span><span>> </span></li><li><span> <td> </span></li><li class="alt"><span> <div align=</span><span class="string">"right"</span><span>>发表日期：<?=</span><span class="vars">$row</span><span>[lastdate]?></div> </span></li><li><span> </td> </span></li><li class="alt"><span> </tr> </span></li><li><span> <?php } </span></li><li class="alt"><span> } </span></li><li><span> ?> </span></li><li class="alt"><span> </table> </span></li></ol>说明：在这个小程序中，有一点不足之处在于，只能同时搜索两个关键字，并且中间用空格" "隔开，如果只是搜索一个关键字，如："大"
显示的时候会出现乱码 ……^|_|^,这是由于下面代码的结果：
<ol class="dp-c"><li class="alt"><span><span> </span><span class="comment">//用空格符把关键字分割开 </span><span> </span></span></li><li><span> </span><span class="vars">$key</span><span>=</span><span class="func">explode</span><span>(</span><span class="string">' '</span><span>, </span><span class="vars">$_GET</span><span>[keyWord]); </span></li></ol>
如果要改进的话，在这里的后面就要做一下判断了。
