Online PHP editor | perf for NvJnV

<?php if (!function_exists('random_bytes')) { /** * PHP 5.2.0 - 5.6.x way to implement random_bytes() * * In order of preference: * 1. mcrypt_create_iv($bytes, MCRYPT_CREATE_IV) * 2. fread() /dev/arandom if available * 3. fread() /dev/urandom if available * 4. COM('CAPICOM.Utilities.1')->GetRandom() * 5. openssl_random_pseudo_bytes() */ if (function_exists('mcrypt_create_iv') && version_compare(PHP_VERSION, '5.3.7') >= 0) { /** * Powered by ext/mcrypt * * @param int $bytes * @return string */ function random_bytes($bytes) { if (!is_int($bytes)) { throw new Exception( 'Length must be an integer' ); } if ($bytes < 1) { throw new Exception( 'Length must be greater than 0' ); } // See PHP bug #55169 for why 5.3.7 is required $buf = mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM); if ($buf !== false) { if (RandomCompat_strlen($buf) === $bytes) { return $buf; } } /** * If we reach here, PHP has failed us. */ throw new Exception( 'PHP failed to generate random data.' ); } } elseif (!ini_get('open_basedir') && (is_readable('/dev/arandom') || is_readable('/dev/urandom'))) { /** * Use /dev/arandom or /dev/urandom for random numbers * * @ref http://sockpuppet.org/blog/2014/02/25/safely-generate-random-numbers * * @param int $bytes * @return string */ function random_bytes($bytes) { static $fp = null; if ($fp === null) { if (is_readable('/dev/arandom')) { $fp = fopen('/dev/arandom', 'rb'); } else { $fp = fopen('/dev/urandom', 'rb'); } } if ($fp !== false) { $streamset = stream_set_read_buffer($fp, 0); if ($streamset === 0) { $remaining = $bytes; $buf = ''; do { $read = fread($fp, $remaining); if ($read === false) { // We cannot safely read from urandom. $buf = false; break; } // Decrease the number of bytes returned from remaining $remaining -= RandomCompat_strlen($read); $buf .= $read; } while ($remaining > 0); if ($buf !== false) { if (RandomCompat_strlen($buf) === $bytes) { /** * Return our random entropy buffer here: */ return $buf; } } } } /** * If we reach here, PHP has failed us. */ throw new Exception( 'PHP failed to generate random data.' ); } } elseif (extension_loaded('com_dotnet')) { /** * Windows with PHP < 5.3.0 will not have the function * openssl_random_pseudo_bytes() available, so let's use * CAPICOM to work around this deficiency. * * @param int $bytes * @return string */ function random_bytes($bytes) { $buf = ''; $util = new COM('CAPICOM.Utilities.1'); $execCount = 0; /** * Let's not let it loop forever. If we run N times and fail to * get N bytes of random data, then CAPICOM has failed us. */ do { $buf .= base64_decode($util->GetRandom($bytes, 0)); if (RandomCompat_strlen($buf) >= $bytes) { return RandomCompat_substr($buf, 0, $bytes); } ++$execCount; } while ($execCount < $bytes); /** * If we reach here, PHP has failed us. */ throw new Exception( 'PHP failed to generate random data.' ); } } elseif (function_exists('openssl_random_pseudo_bytes')) { /** * Since openssl_random_pseudo_bytes() uses openssl's * RAND_pseudo_bytes() API, which has been marked as deprecated by the * OpenSSL team, this is our last resort before failure. * * @ref https://www.openssl.org/docs/crypto/RAND_bytes.html * * @param int $bytes * @return string */ function random_bytes($bytes) { $secure = true; $buf = openssl_random_pseudo_bytes($bytes, $secure); if ($buf !== false && $secure) { if (RandomCompat_strlen($buf) === $bytes) { return $buf; } } /** * If we reach here, PHP has failed us. */ throw new Exception( 'PHP failed to generate random data.' ); } } else { /** * We don't have any more options, so let's throw an exception right now */ throw new Exception( 'There is no suitable CSPRNG installed on your system' ); } } if (!function_exists('RandomCompat_strlen')) { if (function_exists('mb_substr')) { /** * strlen() implementation that isn't brittle to mbstring.func_overload * * This version uses mb_strlen() in '8bit' mode to treat strings as raw * binary rather than UTF-8, ISO-8859-1, etc * * @param string $binary_string * * @return int */ function RandomCompat_strlen($binary_string) { if (!is_string($binary_string)) { throw new InvalidArgumentException( 'RandomCompat_strlen() expects a string' ); } return mb_strlen($binary_string, '8bit'); } } else { /** * strlen() implementation that isn't brittle to mbstring.func_overload * * This version just used the default strlen() * * @param string $binary_string * * @return int */ function RandomCompat_strlen($binary_string) { if (!is_string($binary_string)) { throw new InvalidArgumentException( 'RandomCompat_strlen() expects a string' ); } return strlen($binary_string); } } } if (!function_exists('RandomCompat_substr')) { if (function_exists('mb_substr')) { /** * substr() implementation that isn't brittle to mbstring.func_overload * * This version uses mb_substr() in '8bit' mode to treat strings as raw * binary rather than UTF-8, ISO-8859-1, etc * * @param string $binary_string * @param int $start * @param int $length (optional) * * @return string */ function RandomCompat_substr($binary_string, $start, $length = null) { if (!is_string($binary_string)) { throw new InvalidArgumentException( 'RandomCompat_substr(): First argument should be a string' ); } if (!is_int($start)) { throw new InvalidArgumentException( 'RandomCompat_substr(): Second argument should be an integer' ); } if ($length === null) { /** * mb_substr($str, 0, NULL, '8bit') returns an empty string on * PHP 5.3, so we have to find the length ourselves. */ $length = RandomCompat_strlen($length) - $start; } elseif (!is_int($length)) { throw new InvalidArgumentException( 'RandomCompat_substr(): Third argument should be an integer, or omitted' ); } return mb_substr($binary_string, $start, $length, '8bit'); } } else { /** * substr() implementation that isn't brittle to mbstring.func_overload * * This version just used the default substr() * * @param string $binary_string * @param int $start * @param int $length (optional) * * @return string */ function RandomCompat_substr($binary_string, $start, $length = null) { if (!is_string($binary_string)) { throw new InvalidArgumentException( 'RandomCompat_substr(): First argument should be a string' ); } if (!is_int($start)) { throw new InvalidArgumentException( 'RandomCompat_substr(): Second argument should be an integer' ); } if ($length !== null) { if (!is_int($length)) { throw new InvalidArgumentException( 'RandomCompat_substr(): Third argument should be an integer, or omitted' ); } return substr($binary_string, $start, $length); } return substr($binary_string, $start); } } } var_dump( implode('-', [ bin2hex(random_bytes(4)), bin2hex(random_bytes(2)), bin2hex(\chr((\ord(random_bytes(1)) & 0x0F) | 0x40)) . bin2hex(random_bytes(1)), bin2hex(\chr((\ord(random_bytes(1)) & 0x3F) | 0x80)) . bin2hex(random_bytes(1)), bin2hex(random_bytes(12)) ]) );

Version	System time (s)	User time (s)	Memory (MiB)
7.2.0	0.000	0.017	19.70
7.1.7	0.004	0.004	17.09
7.1.6	0.007	0.007	16.86
7.1.5	0.010	0.007	16.82
7.1.0	0.010	0.067	22.44
7.0.20	0.009	0.006	16.66
7.0.10	0.020	0.033	20.09
7.0.9	0.003	0.043	20.07
7.0.8	0.000	0.080	19.98
7.0.7	0.013	0.073	19.98
7.0.6	0.007	0.043	19.92
7.0.5	0.010	0.080	20.46
7.0.4	0.017	0.073	20.14
7.0.3	0.020	0.057	20.13
7.0.2	0.007	0.077	20.10
7.0.1	0.003	0.080	19.98
7.0.0	0.007	0.040	20.06
5.6.28	0.010	0.067	21.12
5.6.25	0.003	0.070	20.65
5.6.24	0.000	0.067	20.65
5.6.23	0.003	0.050	20.76
5.6.22	0.003	0.067	20.64
5.6.21	0.000	0.073	20.62
5.6.20	0.003	0.073	20.99
5.6.19	0.003	0.050	21.08
5.6.18	0.003	0.043	21.01
5.6.17	0.000	0.050	21.06
5.6.16	0.017	0.063	21.21
5.6.15	0.010	0.050	21.05
5.6.14	0.013	0.073	21.18
5.6.13	0.013	0.053	21.05
5.6.12	0.010	0.077	21.03
5.6.11	0.013	0.073	21.12
5.6.10	0.007	0.080	21.07
5.6.9	0.003	0.053	20.98
5.6.8	0.003	0.043	20.46
5.6.7	0.003	0.033	20.36
5.6.6	0.007	0.040	20.46
5.6.5	0.003	0.033	20.45
5.6.4	0.007	0.040	20.34
5.6.3	0.000	0.040	20.43
5.6.2	0.007	0.030	20.45
5.6.1	0.007	0.037	20.42
5.6.0	0.000	0.040	20.47
5.5.38	0.007	0.077	20.40
5.5.37	0.000	0.043	20.56
5.5.36	0.003	0.073	20.40
5.5.35	0.003	0.057	20.51
5.5.34	0.003	0.043	20.69
5.5.33	0.003	0.083	20.93
5.5.32	0.003	0.087	20.78
5.5.31	0.020	0.070	20.97
5.5.30	0.007	0.043	20.90
5.5.29	0.013	0.070	20.92
5.5.28	0.007	0.070	20.95
5.5.27	0.010	0.070	20.83
5.5.26	0.017	0.073	20.84
5.5.25	0.013	0.077	20.76
5.5.24	0.007	0.030	20.17
5.5.23	0.003	0.037	20.20
5.5.22	0.000	0.037	20.25
5.5.21	0.010	0.037	20.31
5.5.20	0.007	0.030	20.30
5.5.19	0.003	0.043	20.28
5.5.18	0.007	0.030	20.02
5.5.16	0.003	0.040	20.28
5.5.15	0.007	0.033	20.25
5.5.14	0.003	0.040	20.25
5.5.13	0.010	0.027	20.21
5.5.12	0.003	0.033	20.19
5.5.11	0.003	0.040	20.12
5.5.10	0.007	0.030	20.21
5.5.9	0.007	0.040	20.13
5.5.8	0.003	0.033	20.11
5.5.7	0.003	0.043	20.04
5.5.6	0.003	0.040	20.09
5.5.5	0.007	0.037	20.00
5.5.4	0.003	0.037	20.14
5.5.3	0.007	0.037	20.10
5.5.2	0.010	0.033	20.04
5.5.1	0.007	0.033	20.09
5.5.0	0.003	0.037	20.01
5.4.45	0.007	0.063	19.54
5.4.44	0.007	0.043	19.55
5.4.43	0.010	0.037	19.16
5.4.42	0.003	0.043	19.45
5.4.41	0.007	0.037	19.41
5.4.40	0.010	0.057	18.85
5.4.39	0.003	0.040	19.04
5.4.38	0.003	0.037	18.89
5.4.37	0.000	0.043	19.03
5.4.36	0.007	0.037	19.03
5.4.35	0.007	0.030	18.90
5.4.34	0.007	0.037	18.90
5.4.32	0.010	0.050	19.13
5.4.31	0.003	0.037	19.26
5.4.30	0.000	0.037	19.02
5.4.29	0.010	0.033	19.09
5.4.28	0.000	0.037	19.16
5.4.27	0.000	0.033	18.85
5.4.26	0.010	0.033	19.13
5.4.25	0.000	0.033	18.84
5.4.24	0.003	0.040	19.22
5.4.23	0.003	0.053	18.84
5.4.22	0.000	0.043	18.84
5.4.21	0.000	0.040	19.22
5.4.20	0.003	0.040	19.20
5.4.19	0.010	0.027	19.10
5.4.18	0.007	0.037	19.02
5.4.17	0.007	0.037	19.03
5.4.16	0.003	0.033	19.07
5.4.15	0.010	0.033	18.83
5.4.14	0.010	0.023	16.46
5.4.13	0.003	0.037	16.50
5.4.12	0.007	0.033	16.33
5.4.11	0.003	0.030	16.56
5.4.10	0.010	0.063	16.52
5.4.9	0.007	0.073	16.54
5.4.8	0.010	0.047	16.51
5.4.7	0.007	0.057	16.52
5.4.6	0.007	0.060	16.50
5.4.5	0.003	0.067	16.48
5.4.4	0.010	0.040	16.41
5.4.3	0.003	0.063	16.36
5.4.2	0.017	0.027	16.52
5.4.1	0.010	0.040	16.55
5.4.0	0.003	0.060	15.91