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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2011, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Base64UID; |
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class Base64UID |
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{ |
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/** |
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* @var string |
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*/ |
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private static $default_charset = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-'; |
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/** |
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* @throws \Exception |
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* |
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* @param int $length |
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* @param string $charset |
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* |
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* @return string |
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*/ |
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public static function generate($length = 10, $charset = '') |
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{ |
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$charset = $charset ?: self::$default_charset; |
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$charset_size = strlen($charset); |
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$uid = ''; |
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while ($length-- > 0) { |
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$uid .= $charset[self::random(0, $charset_size - 1)]; |
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} |
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return $uid; |
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} |
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/** |
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* Generates cryptographically secure pseudo-random integers. |
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* |
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* Follback for PHP < 7.0 |
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* |
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* @see http://php.net/manual/en/function.random-int.php#119670 |
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* |
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* @throws \Exception |
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* |
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* @param int $min |
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* @param int $max |
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* |
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* @return int|null |
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*/ |
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private static function random($min, $max) |
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{ |
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if (function_exists('random_int')) { |
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return random_int($min, $max); |
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} |
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// @codeCoverageIgnoreStart |
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if (!function_exists('mcrypt_create_iv')) { |
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throw new \Exception('mcrypt must be loaded for random_int to work'); |
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} |
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// @codeCoverageIgnoreEnd |
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$range = $counter = $max - $min; |
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$bits = 1; |
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while ($counter >>= 1) { |
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++$bits; |
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} |
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$bytes = (int) max(ceil($bits / 8), 1); |
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$bitmask = pow(2, $bits) - 1; |
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if ($bitmask >= PHP_INT_MAX) { |
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$bitmask = PHP_INT_MAX; |
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} |
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do { |
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$result = hexdec(bin2hex(mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM))) & $bitmask; |
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} while ($result > $range); |
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return $result + $min; |
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} |
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} |
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gpslab /
base64uid
