html - getting the code executed error while trying to highlight some words in php

I tried to execute some words together to get those words highlighted. But the problem is sometimes but not all the times the code is being executed. The code that i used are here:

function highlightKeywords($text, $keyword) {
  
    $pos = strpos($text, $keyword);

    $wordsAry = explode(" ", $keyword);
    
    $wordsCount = count($wordsAry);
        
    for ($i = 0; $i < $wordsCount; $i++) {
        if ($pos === false) {
            if ($i === 0) {
                $highlighted_text = "<span style='font-weight:700;color:#151313;'>" . ucfirst(strtolower($wordsAry[$i])) . "</span>";
            } else {
                $highlighted_text = "<span style='font-weight:700;color:#151313;'>" . strtolower($wordsAry[$i]) . "</span>";
            }
        } else {
             if ($i === 0) {
                 $highlighted_text = "<span style='font-weight:700;color:#151313;'>" . strtolower($wordsAry[$i]) . "</span>";
             } else {
                $highlighted_text = "<span style='font-weight:700;color:#151313;'>" . $wordsAry[$i] . "</span>";
            }
        }
        $text = str_ireplace($wordsAry[$i], $highlighted_text, $text);
    }
    return $text;
}
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here the $text is the whole text that i pass and the $keyword is the word or words that i want to highlight.Here i had some doubt of making the first letter capital that i made by asking question make first letter caps in php but ucfirst(strtolower('string')) does not work . But from this solution only i rearranged my code that is above. But the problem i face is when i pass$text='Vegetarische cup a Soup' and$keyword='cup a soup' i get the following code being executed:

Vegetarische an style='font-weight:700;color:#151313;'>cupan> a Soup
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Can someone please help me to resolve this error.

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