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$str = '6228480402564890018';
preg_match('/^([1-9]{1})(\d{14}|\d{18})$/', $str,$match);
print_r($match[0]);
$str = '6228480402564890018';
preg_match('/([\d]{4})([\d]{4})([\d]{4})([\d]{4})([\d]{0,})?/', $str,$match);
unset($match[0]);
echo implode(' ', $match);