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<?php |
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namespace Helldar\Support\Helpers; |
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final class Digit |
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{ |
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/** |
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* Calculating the factorial of a number. |
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* |
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* @param int $n |
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* |
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* @return int |
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*/ |
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public function factorial(int $n = 0): int |
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{ |
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if ($n === 0) { |
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return 1; |
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} |
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return $n * $this->factorial($n - 1); |
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} |
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/** |
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* Converts a number into a short version. |
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* eg: 1000 >> 1K. |
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* |
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* @param float $number |
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* @param int $precision |
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* |
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* @return string |
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*/ |
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public function toShort(float $number, int $precision = 1): string |
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{ |
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$length = strlen((string) ((int) $number)); |
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$length = ceil($length / 3) * 3 + 1; |
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$suffix = $this->suffix($length); |
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$value = $this->rounded($number, $length, $precision); |
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return $value . $suffix; |
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} |
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/** |
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* Create short unique identifier from number. |
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* Actually using in short URL. |
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* |
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* @param int $number |
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* @param string $chars |
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* |
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* @return string |
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*/ |
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public function shortKey(int $number, string $chars = 'abcdefghijklmnopqrstuvwxyz'): string |
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{ |
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$length = strlen($chars); |
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$mod = $number % $length; |
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if ($number - $mod === 0) { |
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return substr($chars, $number, 1); |
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} |
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$result = ''; |
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while ($mod > 0 || $number > 0) { |
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$result = substr($chars, $mod, 1) . $result; |
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$number = ($number - $mod) / $length; |
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$mod = $number % $length; |
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} |
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return $result; |
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} |
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/** |
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* Format a number with grouped with divider. |
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* |
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* @param float $number |
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* @param int $length |
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* @param int $precision |
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* |
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* @return float |
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*/ |
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public function rounded(float $number, int $length = 4, int $precision = 1): float |
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{ |
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$divided = (float) bcpow(10, $length - 4, 2); |
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return round($number / $divided, $precision); |
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} |
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protected function suffix(int $length = 0): string |
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{ |
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$available = [ |
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4 => '', |
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7 => 'K', |
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10 => 'M', |
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13 => 'B', |
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16 => 'T+', |
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]; |
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return $available[$length] ?? end($available); |
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} |
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} |
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andrey-helldar /
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