php做站内搜索并高亮显示关键字
本文章介绍一篇较实用的文章关于php做站内搜索并高亮显示关键字,这个很多朋友直接利用preg_replace来操作,这是正确的哦,不过我觉得用str_replace更快一些哦,至于原因自己查查这两个函数的区别吧。
如何使用php做站内搜索并高亮显示关键字?代码如下:
<?php require_once 'sqlTools.class.php'; //封装类,可执行dql、dml语句 $info = $_POST['info']; $sql = "select name,password,email from user_500 where name like '%$info%' or password like '%$info%' or email like '%$info%'"; $sqlTools = new SqlTools(); $res = $sqlTools->execute_dql($sql); while ($row = mysql_fetch_assoc($res)) { $row['name'] = preg_replace("/($info)/i", "<b style=\"color:red\">1</b>", $row['name']); $row['password'] = preg_replace("/($info)/i", "<b style=\"color:red\">1</b>", $row['password']); $row['email'] = preg_replace("/($info)/i", "<b style=\"color:red\">1</b>", $row['email']); echo $row['name'] . "-->" . $row['password'] . "-->" . $row['email'] . "<br>"; } ?>
思路分析:将sql语句中包含的%$info%交给DBMS执行的时候,他会查找字段中含有变量$info的值的信息,
%$info--->查找以$info的值结束的信息
$info%--->查找以$info的值开头的信息
通过正则函数preg_replace()将搜索到的关键字高亮显示,比如:
$row['name']=preg_replace("/($info)/i","1",$row['name']);
的意思是:通过POST方接收到的值$info替换为加上样式(红色加粗)的结果,并将结果重新赋给$row[‘name’]
如果要搜索多个关键字的话,可以对接收到值$info进行分割,比如$info_more=explode(" ",$info);//这种方式能对以空格隔开的关键字进行分割,再对分割后的结果挨个进行查询,同样,可以使用正则表达式函数进行替换工作,以高亮显示关键字,代码如下:
sqlTools.class.php的源代码:
<?php class SqlTools { private $host = "localhost"; private $dbname = "test"; private $dbuser = "root"; private $dbpwd = ""; private $conn; public function __construct() { $this->conn = mysql_connect($this->host, $this->dbuser, $this->dbpwd); if (!$this->conn) { die("连接数据库失败" . mysql_error()); } mysql_select_db($this->dbname, $this->conn) or die("找不到该数据库" . mysql_error()); mysql_query("set names utf8"); } public function execute_dml($sql) { $bool = mysql_query($sql); if ($bool) { if ($bool > 0) { return 1; } else { return 2; } } else { return 0; } } public function execute_dql($sql) { $res = mysql_query($sql); return $res; } public function close_conn() { mysql_close($this->conn); } } ?>
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