Highlight words in string

Question

I have a bunch of text and i want to highlight some words on that text. I've search the stackoverflow website and came up with something that almost work.

PHP

function highlighter($str, $arr_word)
{
    foreach($arr_word as $vword) {
        $text = preg_replace("|($vword)|Ui", "<span class=highlight>$1</span>", $str);
    }

    return $text;
}

$lyrics = 'hello looking for';
$arr_accepted_keyword = array('hello', 'for');

echo highlighter($lyrics, $arr_accepted_keyword);

For some reason, it always highligths the last word, and not all the words. Why?

Answer 1

The problem is that you're highlighting each word in the original string, not the updated string.

function highlighter($str, $arr_word)
{
    foreach($arr_word as $vword) {
        $str = preg_replace("/($vword)/Ui", "<span class=highlight>$1</span>", $str);
    }

    return $str;
}

$lyrics = "hello, is it me you're looking for?";
$arr_accepted_keyword = array('hello', 'for');

echo highlighter($lyrics, $arr_accepted_keyword);
// "<span class=highlight>hello</span>, is it me you're looking <span class=highlight>for</span>?"