[php做站内搜索]php做站内搜索并高亮显示关键字

时间:2017-06-06  来源:php常用代码  阅读:

如何使用php做站内搜索并高亮显示关键字?

 代码如下

       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","\1",$row["name"]);

              $row["password"]=preg_replace("/($info)/i","\1",$row["password"]);

              $row["email"]=preg_replace("/($info)/i","\1",$row["email"]);

              echo $row["name"]."-->".$row["password"]."-->".$row["email"]."
";

       }   

?>

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:

       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);

              }

       }

?>

[php做站内搜索]php做站内搜索并高亮显示关键字

http://m.bbyears.com/jiaocheng/33183.html

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