Discussion on: Daily Challenge #263 - Reverse Words

function reverseWords($words) {
    $pattern = '/\S+/';
    return preg_replace_callback(
        $pattern,
        function ($word) {
            return strrev($word[0]);
        },
        $words
    );
}

echo reverseWords('The quick brown fox jumps over the lazy dog.');
echo reverseWords('double spaced words');