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<!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 = "365 days"; $patterns = [ '/[a-z]+/i' => 'countLetters', '/[0-9]+/' => 'countDigits' ]; $result = preg_replace_callback_array($patterns, $input); echo $result; ?> </body> </html>
365[3digit] days[4[1digit]letter]
