Online PHP editor | refs for 8C3lC

<?php function chk($word) { echo PHP_EOL . 'Word: ' . $word . ' - '; if (preg_match('/^[0-9]+$/u', $word)) { echo 'Ok.' . PHP_EOL; } else { echo 'Ng.' . PHP_EOL; }; } chk('abc12345'); chk('ａｂｃ１２３４５'); chk('12345abc'); chk('１２３４５ａｂｃ'); chk('12345'); chk('１２３４５'); chk('1１2２3３4４5５'); chk('12.345');