看PHP如何实现多关键字加亮_PHP教程

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：

实现代码：

conn.php

<ol class="dp-c">
<li class="alt"><span><span><?php  </span></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></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>
<span class="string">"center"</span><span>>  </span><li class="alt"><span>     <form>
<span class="string">""</span><span> method=</span><span class="string">"get"</span><span>>  </span>
</form></span></li>
<li><span>     <tr>  <li class="alt">
<span>         </span><td>关键字：<input><span class="string">"text"</span><span> name=</span><span class="string">"keyWord"</span><span> />  </span><li><span>         <input><span class="string">"submit"</span><span> value=</span><span class="string">"搜索"</span><span> /></span></span></li>
</td>  </li>
<li class="alt"><span>     </span></li>
</tr>  </span></li>
<li><span>       </span></li>
<li class="alt"><span> </span></li>
</table>  </span></li>
<li><span>   </span></li>
<li class="alt"><span> <table>
<span class="string">"0"</span><span> align=</span><span class="string">"center"</span><span> cellpadding=</span><span class="string">"5"</span><span> </span><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></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><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><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><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><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>
<span class="string">"#eff3ff"</span><span>>  </span><li class="alt">
<span>         </span><td>标题：<font><span class="string">"black"</span><span>>=</span><span class="vars">$row</span><span>[title]?></span></font> 用户：<font><span class="string">"black"</span><span>>=</span><span class="vars">$row</span><span>[user] ?></span></font>  <li><span>         <div>
<span class="string">"right"</span><span>><a><span class="string">"preEdit.php?id==$row[id]?>"</span><span>>编辑</span></a>  |  <a><li class="alt">
<span>             href=</span><span class="string">"delete.php?id==$row[id]?>"</span><span>>删除</span>
</li></a></span>
</div>  </span></li>
<li><span>         </span></li>
</td>  </li>
<li class="alt"><span>     </span></li>
</tr>  </span></li>
<li><span>     <tr>
<span class="string">"#ffffff"</span><span>>  </span><li class="alt">
<span>         </span><td>内容：=<span class="vars">$row</span><span>[content]?></span>
</td>  </li>
<li><span>     </span></li>
</tr>  </span></li>
<li class="alt"><span>     <tr>
<span class="string">"#ffffff"</span><span>>  </span><li>
<span>         </span><td>  <li class="alt"><span>         <div>
<span class="string">"right"</span><span>>发表日期：=</span><span class="vars">$row</span><span>[lastdate]?></span>
</div>  </span></li>
<li><span>         </span></li>
</td>  </li>
<li class="alt"><span>     </span></li>
</tr>  </span></li>
<li><span>     <?php  }  </span></span></li>
<li class="alt"><span>     }  </span></li>
<li><span>     ?>  </span></li>
<li class="alt"><span> </span></li>
</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。

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