PHP加粗搜索结果中关键字

<p>function highlighter_text($text, $words){</p><p>    $split_words = explode( " " , $words );</p><p>    foreach($split_words as $word)    {</p><p>        $color = "#4285F4";</p><p><span>立即学习</span>“<a href="https://pan.quark.cn/s/7fc7563c4182" style="text-decoration: underline !important; color: blue; font-weight: bolder;" rel="nofollow" target="_blank">PHP免费学习笔记（深入）</a>”；</p><p>        $text = preg_replace("|($word)|Ui" ,            "<b>$1</b>" , $text );</p><p>    }</p>
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                <p>    return $text;</p><p>}</p><p>$string = "I like chocolates and I like apples";$words = "apple";</p><p>echo highlighter_text($string ,$words);</p>