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<?php $digits = 10; foreach([7887.0000000000000000, 8667887.0000000000000000, 0.0786451, 1.0786451] as $lastPrice) { $price = number_format($lastPrice, 16, '.', ''); $price = ltrim($price, '-'); $price = rtrim($price, '0'); list($d, $s) = explode('.', $price); var_dump($price); var_dump([$d, $s]); if ($d !== '0') { $round = $digits - strlen($d); } else { $round = $digits + strlen($s) - strlen(ltrim($s, '0')); } var_dump($round); } return; foreach ([7887.0000000000000000, 0.0786451] as $price) { $maxDigits = 5; $log = floor(round(log($price) / M_LN10, 10)); var_dump($log); var_dump((10 ** ($maxDigits - $log))); }