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<?php |
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declare(strict_types=1); |
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namespace Gambling\Tech; |
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use Exception; |
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use Gambling\Tech\Exception\InvalidArgumentException; |
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class Random |
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{ |
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/** |
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* Generate random bytes using different approaches |
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* |
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* @param int $length |
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* @return string |
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* @throws Exception |
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*/ |
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public static function getBytes(int $length): string |
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{ |
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return random_bytes($length); |
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} |
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/** |
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* @param int $min |
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* @param int $max |
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* @return int |
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* @throws Exception |
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*/ |
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public static function getInteger(int $min, int $max): int |
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{ |
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return random_int($min, $max); |
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} |
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/** |
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* @return bool |
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* @throws Exception |
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*/ |
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public static function getBoolean(): bool |
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{ |
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$byte = static::getBytes(1); |
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return (bool)(ord($byte) % 2); |
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} |
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/** |
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* @return float |
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* @throws Exception |
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*/ |
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public static function getFloat(): float |
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{ |
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$bytes = static::getBytes(7); |
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$bytes[6] = $bytes[6] | chr(0xF0); |
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$bytes .= chr(63); // exponent bias (1023) |
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$float = unpack('d', $bytes)[1]; |
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return ($float - 1); |
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} |
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/** |
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* @param int $length |
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* @param array $charlist |
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* @return string |
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* @throws Exception |
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*/ |
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public static function getString(int $length, array $charlist = []) |
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{ |
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if ($length < 1) { |
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throw new InvalidArgumentException('Length should be >= 1'); |
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} |
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// charlist is empty or not provided |
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if (empty($charlist)) { |
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$numBytes = (int)ceil($length * 0.75); |
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$bytes = static::getBytes($numBytes); |
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return mb_substr(rtrim(base64_encode($bytes), '='), 0, $length, '8bit'); |
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} |
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$listLen = mb_strlen($charlist, '8bit'); |
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if ($listLen === 1) { |
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return str_repeat($charlist, $length); |
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} |
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$result = ''; |
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for ($i = 0; $i < $length; $i++) { |
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$pos = static::getInteger(0, $listLen - 1); |
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$result .= $charlist[$pos]; |
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} |
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return $result; |
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} |
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} |
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nepster-web /
gambling-tech
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