mysql-php matching string changes color after search

How to make PHP search for mysql and change the color of matching strings?

For example, search 123

Assuming that it matches 123: 09148

1234097

It will change like this

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How to make PHP search for mysql and change the color of matching strings?

For example, search 123

Assuming that it matches 123: 09148

1234097 It will change like this

Regular replacement, html tag + css

<code class="php">$keyword = yourobj->yourmethod();
$pattern = "/$keyword/i";
$replacement = "<span class='hl'>$keyword</span>";
echo preg_replace($pattern, $replacement, $keyword);</code>

The general idea is to find the keyword and add a style.