Online PHP editor | refs for DLqUh

<?php $strings = [ "<p>We've been in business since 1998 and produced this logo design [2002] years ago.</p>", "<p>We've been in business since 1998 and produced this logo design [2017] years ago.</p>" ]; foreach ($strings as $string) { preg_match('/\[(\d{4})\] years/', $string, $matches); $years = date('Y') - $matches[1]; $result = sprintf("%s year%s", $years, $years === 1 ? "": "s" ); echo str_replace($matches[0], $result, $string) . PHP_EOL; }