搜索＆amp;突出显示多关键字

Question

当我按下“处理”按钮时，我希望文本突出显示关键字上的相关字词：

我尝试使用preg_replace（$ keyword，$ keywords）无效。有人帮吗？谢谢！

Answer 1

你可以做这样的事情

<?php
$str="Hello World You are on StackOverflow";// Your large text
$arrMatchWords=array("World","on");// Provide all your matching text.

foreach($arrMatchWords as $k=>$v)
{
    $str=str_replace($v,"<span style='background:#ffff00'>".$v."</span>",$str);
}

echo ($str);

<强>输出：

Answer 2

$keywords = array("computers" => NULL,"paper" => NULL, "rocket" => NULL);
$text = preg_split('/\s/', $my_text_string);
foreach($text as $key => $value)
{
  if(array_key_exists($value, $keywords)) {
          echo $value . "\n";
            $text[$key] = '<span style="background:yellow">'. $value . '</span>';
    }
}

$my_text_string = implode(' ', $text);
echo $my_text_string;
?>