<!DOCTYPE html>
<html>
<body>
<?php
function countLetters($matches) {
return $matches[0] . '[' . strlen($matches[0]) . 'letter]';
}
function countDigits($matches) {
return $matches[0] . '[' . strlen($matches[0]) . 'digit]';
}
$input = "There are 365 days in a year.";
$patterns = [
'/\b[a-z]+\b/i' => 'countLetters',
'/\b[0-9]+\b/' => 'countDigits'
];
$result = preg_replace_callback_array($patterns, $input);
echo $result;
?>
</body>
</html>
