How to highlight keywords in site search results?

How to highlight keywords in the returned results when searching within the site?

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How to highlight keywords in the returned results when searching within the site?

You can use pair replacementfunction strtr:
string strtr ( string $str , array $replace_pairs )

<code><?php
header('Content-Type: text/plain; charset=utf-8');
$arr = array('中国', '中国人'); //关键字
foreach($arr as $v) { $new[$v] = '<b>'.$v.'</b>'; }
var_export($new); //输出: array( '中国' => '<b>中国</b>', '中国人' => '<b>中国人</b>' )
$str = '我是中国人我爱中国';
echo strtr($str, $new)."\n"; //输出: 我是<b>中国人</b>我爱<b>中国</b>

//对比:str_replace会发生重复替换,下面代码会输出: 我是<b><b>中国</b>人</b>我爱<b>中国</b>
echo str_replace(array('中国人','中国'), array('<b>中国人</b>','<b>中国</b>'), '我是中国人我爱中国');</code>

It is recommended to use elasticsearch. This is a search engine written in java and based on lunce

<code><?php
$str = "Hello world!";
$keyword = "world";
echo str_replace($keyword, "<font color='red'>" . $keyword . "</font>", $str);
?></code>