highlight multiple keywords in search

Question

i\'m using this code to highlight search keywords:

function highlightWords($string, $word)
 {

        $string = str_replace($word, \"

        

Answer 1

as suggested by user187291, just change following code in order to get text highlighted with yellow background.

 return preg_replace($re, '<SPAN style="BACKGROUND-COLOR: #ffff00"><b>$0</b></SPAN>', $text); 

Answer 2

The other solutions may be case-insensitive in finding the highlight terms, but do not preserve their case of the original string. So searching for "st" will find "ST" but highlight it as "st", the search term.

I use the following. It first forms the replace array, and then uses str_replace() with array parameters - which avoids recursion.

function highlightStr($haystack, $needle, $highlightStyle) {

    if (strlen($highlightStyle) < 1 || strlen($haystack) < 1 || strlen($needle) < 1) {
       return $haystack;
    }

    preg_match_all("/$needle+/i", $haystack, $matches);

    $matches[0] = array_unique($matches[0]);

    if (is_array($matches[0]) && count($matches[0]) >= 1) {
        foreach ($matches[0] as $ii=>$match)
            $replace[$ii]="<span style='$highlightStyle'>$match</span>";

        $haystack = str_replace($matches[0], $replace, $haystack);
    }

    return $haystack;
}

Answer 3

Highlight multiple keywords in search including umlauts

I've used the regex written before and replaced \w with [A-Za-z0-9_äöüÄÖÜ]. As you see I added the umlauts äöüÄÖÜ. I also have removed the \b so it will match any appearance of the search term.

Example

search term:
Su shamp

text:
Sun shiny shampoo

result:
Sun shiny shampoo

---

The code I've used:

private function getSearchTermToBold($text, $words)
{
    preg_match_all('~[A-Za-z0-9_äöüÄÖÜ]+~', $words, $m);
    if (!$m)
        return $text;
    $re = '~(' . implode('|', $m[0]) . ')~i';
    return preg_replace($re, '<b>$0</b>', $text);
}

Answer 4

Splits your search query up into words, then highlight each words separately.

It might work out better to perform the highlighting in javascript though. jQuery's "contains" selector will probably help avoid problems of replacing markup elements as you go...

http://api.jquery.com/contains-selector/

Answer 5

regular expressions is the way to go!

function highlight($text, $words) {
    preg_match_all('~\w+~', $words, $m);
    if(!$m)
        return $text;
    $re = '~\\b(' . implode('|', $m[0]) . ')\\b~';
    return preg_replace($re, '<b>$0</b>', $text);
}

$text = '
Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
consequat.
';

$words = 'ipsum labore';

print highlight($text, $words);

To match in a case-insensitive manner, add 'i' to the regular expression

    $re = '~\\b(' . implode('|', $m[0]) . ')\\b~i';

NB: for non-enlish letters like "ä" the results may vary depending on the locale.

Answer 6

PHP > 5.3.0, try preg_filter()

/**
 * Highlighting matching string
 * @param   string  $text           subject
 * @param   string  $words          search string
 * @return  string  highlighted text
 */
public function highlight($text, $words) {
    $highlighted = preg_filter('/' . preg_quote($words, '/') . '/i', '<b><span class="search-highlight">$0</span></b>', $text);
    if (!empty($highlighted)) {
        $text = $highlighted;
    }
    return $text;
}