Question

I have a PHP search script and I want to highlight the keywords that the user has searched with tags. How can I do this?

My code is:

if(!empty($_GET['q'])){
$keywords=explode(' ',$_GET['q']);
foreach($keywords as $query){
$query=mysql_real_escape_string($query);
$likes[]="keywords LIKE '%{$query}%'";
}

$searchResult=mysql_query("select * from questions where ".implode('or ',$likes)."limit 1");
while($row=mysql_fetch_assoc($searchResult)){
    $results="<div class='webresult'>{$row['result']}</div>";
}
}

Answer 1

If $row['result'] does not contain html, you can do a string replace: replace all keywords in the result with <span class="highlight">keyword</span>

A simple example:

...
while($row=mysql_fetch_assoc($searchResult)) {
  $res = $row['result'];
  foreach($keywords as $kw) {
    $res = str_replace($kw, '<span class="highlight">' . htmlspecialchars($kw) . '</span>', $res);
  }
  $results="<div class='webresult'>{$res}</div>";
}
...