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<?php $word = new NumberFormatter('en', NumberFormatter::SPELLOUT); $number = [1,5,10,15, 99, 10000000]; rsort($number); // sort by highest number first // make words from numbers $text = array_map(fn($num) => $word->format($num), $number); // example $str = '1 5 10 15 99 10000000'; echo str_replace($number, $text, $str);

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