参考网上的博客，实现简单的搜索结果关键词描红效果。
建库建表sql：
DROP DATABASE IF EXISTS `book`; CREATE DATABASE IF NOT EXISTS `book` DEFAULT CHARSET = `utf8`; USE `book`; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for tb_book -- ---------------------------- DROP TABLE IF EXISTS `tb_book`; CREATE TABLE `tb_book` ( `id` int(0) NOT NULL AUTO_INCREMENT COMMENT '主键id', `name` varchar(255) NOT NULL COMMENT '书名', `description` varchar(255) DEFAULT NULL COMMENT '简介', PRIMARY KEY (`id`) ) ENGINE = InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of tb_book -- ---------------------------- INSERT INTO `tb_book` VALUES (1, 'Linux从入门到超神', 'Linux学习宝典'); INSERT INTO `tb_book` VALUES (2, 'PHP从菜鸟变高手', 'PHP零基础教学'); INSERT INTO `tb_book` VALUES (3, 'Java从自闭到入坟', 'Java程序员的自我修养'); INSERT INTO `tb_book` VALUES (4, 'C核心思想', '了解C语言编程的核心思想'); INSERT INTO `tb_book` VALUES (5, 'Python之禅', '从入世到出世');
test.php：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>PHP实现关键词描红效果</title>
<link rel="stylesheet" href="">
</head>
<body>
<form action="#" method="post">
<input type="search" placeholder="请输入关键词" name="keyword">
<input type="submit" value="提交" />
</form>
<?php
if(!empty($_POST['keyword'])){
$keyword = $_POST['keyword'];//获取输入的关键字
//进行数据库连接
$conn = mysqli_connect("localhost","root","123456");
if(!$conn){
die("数据库连接失败！");
}
$flag = mysqli_select_db($conn,"book");
if(!$flag){
die("数据库打开失败！");
}
$sql = "select * from tb_book where name like '%$keyword%' or description like '%$keyword%'";
$result = mysqli_query($conn,$sql);
while($row = mysqli_fetch_assoc($result)){
?>
<div style="width:300px;height:100px;background-color: #ccc;margin-bottom: 10px">
<!--使用str_ireplace()函数将结果集中的关键词替换成带样式的（红色字体）-->
<p>书名：<?php echo str_ireplace($keyword, "<span style=\"color: #f00; \">$keyword</span>",$row['name'])?></p>
<p>简介：<?php echo str_ireplace($keyword, "<span style=\"color: #f00; \">$keyword</span>",$row['description'])?></p>
</div>
<?php
}
}else{
echo "暂未匹配到相关书籍！";
}
?>
</body>
</html>
效果：
