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<?php |
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/** |
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* Copyright © 2017 Toan Nguyen. All rights reserved. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Gojira\Framework\Math; |
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/** |
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* Random data generator |
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* |
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* @api |
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*/ |
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class Random |
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{ |
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/**#@+ |
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* Frequently used character classes |
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*/ |
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const CHARS_LOWERS = 'abcdefghijklmnopqrstuvwxyz'; |
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const CHARS_UPPERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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const CHARS_DIGITS = '0123456789'; |
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/**#@-*/ |
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/** |
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* Get random string |
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* |
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* @param int $length |
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* @param null|string $chars |
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* |
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* @return string |
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* @throws \Gojira\Framework\Exception\LocalizedException |
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*/ |
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public function getRandomString($length, $chars = null) |
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{ |
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$str = ''; |
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if (null === $chars) { |
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$chars = self::CHARS_LOWERS . self::CHARS_UPPERS . self::CHARS_DIGITS; |
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} |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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// use openssl lib if it is installed |
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View Code Duplication |
for ($i = 0, $lc = strlen($chars) - 1; $i < $length; $i++) { |
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$bytes = openssl_random_pseudo_bytes(PHP_INT_SIZE); |
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$hex = bin2hex($bytes); // hex() doubles the length of the string |
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$rand = abs(hexdec($hex) % $lc); // random integer from 0 to $lc |
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$str .= $chars[$rand]; // random character in $chars |
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} |
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} elseif ($fp = fopen('/dev/urandom', 'rb')) { |
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// attempt to use /dev/urandom if it exists but openssl isn't available |
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View Code Duplication |
for ($i = 0, $lc = strlen($chars) - 1; $i < $length; $i++) { |
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$bytes = fread($fp, PHP_INT_SIZE); |
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$hex = bin2hex($bytes); // hex() doubles the length of the string |
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$rand = abs(hexdec($hex) % $lc); // random integer from 0 to $lc |
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$str .= $chars[$rand]; // random character in $chars |
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} |
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fclose($fp); |
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} else { |
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throw new \Gojira\Framework\Exception\LocalizedException( |
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new \Gojira\Framework\Phrase("Please make sure you have 'openssl' extension installed") |
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); |
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} |
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return $str; |
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} |
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/** |
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* Return a random number in the specified range |
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* |
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* @param $min [optional] |
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* @param $max [optional] |
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* |
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* @return int A random integer value between min (or 0) and max |
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* @throws \Gojira\Framework\Exception\LocalizedException |
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*/ |
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public static function getRandomNumber($min = 0, $max = null) |
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{ |
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if (null === $max) { |
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$max = mt_getrandmax(); |
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} |
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$range = $max - $min + 1; |
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$offset = 0; |
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if (function_exists('openssl_random_pseudo_bytes')) { |
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// use openssl lib if it is installed |
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$bytes = openssl_random_pseudo_bytes(PHP_INT_SIZE); |
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$hex = bin2hex($bytes); // hex() doubles the length of the string |
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$offset = abs(hexdec($hex) % $range); // random integer from 0 to $range |
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} elseif ($fp = fopen('/dev/urandom', 'rb')) { |
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// attempt to use /dev/urandom if it exists but openssl isn't available |
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$bytes = fread($fp, PHP_INT_SIZE); |
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$hex = bin2hex($bytes); // hex() doubles the length of the string |
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$offset = abs(hexdec($hex) % $range); // random integer from 0 to $range |
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fclose($fp); |
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} else { |
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throw new \Gojira\Framework\Exception\LocalizedException( |
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new \Gojira\Framework\Phrase("Please make sure you have 'openssl' extension installed") |
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); |
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} |
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return $min + $offset; // random integer from $min to $max |
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} |
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/** |
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* Generate a hash from unique ID |
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* |
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* @param string $prefix |
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* |
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* @return string |
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*/ |
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public function getUniqueHash($prefix = '') |
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{ |
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return $prefix . md5(uniqid(microtime() . self::getRandomNumber(), true)); |
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} |
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} |
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nntoan /
Gojira
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.