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run code in 300+ PHP versions simultaneously
<?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' ); } } var_dump( implode('-', [ bin2hex(random_bytes(4)), bin2hex(random_bytes(2)), bin2hex((random_bytes(1) & 0x0F) | 0x40) . bin2hex(random_bytes(1)), bin2hex((random_bytes(1) & 0x3F) | 0x80) . bin2hex(random_bytes(1)), bin2hex(random_bytes(12)) ]) );
Output for 7.4.25
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "0f4650cc-ae26-3634fc-3132384a-c5c60d7fe0c6d0ccc8b792f7"
Output for 7.3.5
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "1c3d0c81-d8a2-36341b-313238e4-bb0d422d5228cebb4f1deca4"
Output for 7.2.4
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "68dc88c1-ac7f-3634fa-3132383d-8cb54c79f65267af4bd5a7e1"
Output for 7.2.3
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "96d5301b-c299-363435-313238bb-f1be99b385afb8c7b9292e7e"
Output for 7.2.2
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "a477f5ab-0b4b-363431-3132387f-4836f68528ace47963bed04d"
Output for 7.2.1
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "c7d32c6e-3ed2-363474-31323801-e34dd91a4016a30819e7461c"
Output for 7.2.0
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "15500de3-3019-363487-31323874-d4c0655b8b943504e8dc15d9"
Output for 7.1.16
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "01206540-7045-3634f0-31323807-ee246424c9600681be78f2df"
Output for 7.1.15
Warning: A non-numeric value encountered in /in/i0k74 on line 172 string(54) "329f5354-dd79-3634d7-3133324d-8ee390acd7920fcb28e29a07"
Output for 7.1.14
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "adaf1a6a-b9b6-36346c-3132388e-6c231f2b3272b2a9850f3e20"
Output for 7.1.13
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "c4350682-b6f0-363467-31323811-c411b2dd24f885529f326530"
Output for 7.1.12
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "d0746e1e-dbb4-363445-31323856-bc9b068d7a7a4f193393bc42"
Output for 7.1.11
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "70b755b3-11bf-363436-31323839-8df6d2d153eb0785eb6556e6"
Output for 7.1.10
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "b650dda7-7ced-36348b-313238fa-beb0206aae948d2fc298d7fa"
Output for 7.1.9
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "c897b106-6beb-36349d-313238ae-80a2befa7b0ee8b66dfa1b9b"
Output for 7.1.8
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "a7ac9c6b-bd58-3634ef-313238ad-c581c21afac01c20556a4c79"
Output for 7.1.7
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "0b40b063-396d-363448-31323808-370776f9056a254ed8026666"
Output for 7.1.6
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "c98107b2-1d8c-36341f-31323811-dabd6d3131c0c62cc2129702"
Output for 7.1.5
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "bb161a6e-cc0b-363466-3132386c-4fb1a7a8f7924b94f6fc3d78"
Output for 7.1.4
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "821f505a-c51b-363440-31323826-48243b620274c786f317a27d"
Output for 7.1.3
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "49176914-ef75-36346d-31323871-7b3a64ba05faa121f5cb8b3b"
Output for 7.1.2
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "94ba6f7b-93bf-363497-3132389e-0da5f219ffeec5d8cdd77919"
Output for 7.1.1
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "babb529f-8561-3634b4-31323865-bb696b4130425166063846f7"
Output for 7.1.0
Warning: A non-numeric value encountered in /in/i0k74 on line 172 Warning: A non-numeric value encountered in /in/i0k74 on line 173 string(54) "c4cafda1-931e-36340a-3132389c-a0eac75949a39ab41a83989a"
Output for 7.0.29
string(54) "f66ec0a2-027a-36341d-313238c6-746f7e886c371f72524a3982"
Output for 7.0.27
string(54) "aa554692-9522-3634bc-31323824-e5f4b1c854866e0e49f9c8c9"
Output for 7.0.26
string(54) "9a5dd9d6-136a-373261-313238f9-8475bd433144e4d1b8bef5a5"
Output for 7.0.25
string(54) "8fe50459-91b0-3634f8-313238b9-4259131a47107ae0b280b6ea"
Output for 7.0.24
string(54) "be2cc896-28f2-3634d6-313238dd-a1acc88cfc9282647cfb05b6"
Output for 7.0.23
string(54) "ae91c364-1b91-363413-313238c4-4a01fa053dc9bd5c1bf9e8c6"
Output for 7.0.22
string(54) "1d0c6663-167f-3634b5-3132387d-c6bad37418a09585b0356c05"
Output for 7.0.21
string(54) "19e67926-65a4-363406-313238bd-bcd78376e53e75981c70327f"
Output for 7.0.20
string(54) "94a28189-0eb2-3634a8-313238fc-3f5f0636d6bb5218660f6d0a"
Output for 7.0.19
string(54) "2cb7dda2-37cd-3634fe-31323827-0fd07a52793ed9ef095614ee"
Output for 7.0.18
string(54) "05770612-3636-3634a7-313333c4-45e5e3029043b545e66d806a"
Output for 7.0.17
string(54) "75d20d47-6e85-3634c2-313238a5-0bcf5a00c8041085b6aa545a"
Output for 7.0.16
string(54) "603f5149-2bcf-36340b-313238a4-46f5ca9275407d6b178ea4e9"
Output for 7.0.15
string(54) "f87f6a78-9938-3634d3-313238ce-8f4148f8e25f0ac0159f5579"
Output for 7.0.14
string(54) "d8f5ca69-d47e-37331f-31323890-9dedd0283410645b7571e8d0"
Output for 7.0.13
string(54) "e0809c73-671d-36345f-31323869-7b13668cbc58ea28e0867b07"
Output for 7.0.12
string(54) "0ad64bd4-2069-3634eb-31323875-f351be8a2b110a4753c16b48"
Output for 7.0.11
string(54) "366a545c-294d-363437-31323864-49831c5192fe4c1d0cd7f9c5"
Output for 7.0.10
string(54) "c41548f6-d1f6-363414-313238c1-5ced1ec1cde9be8c4581308f"
Output for 7.0.9
string(54) "2c3d5258-d30d-3634c6-3132387e-bd8436fa78d35ed7fd4666df"
Output for 7.0.8
string(54) "cf9f23c7-4364-363428-3132388c-2d0cfbcf6dddadf0e7583aa6"
Output for 7.0.7
string(54) "12b1b575-07d1-363412-313238d1-68634938d16801a0692fe24c"
Output for 7.0.6
string(54) "862198aa-02c5-3634b9-31323853-86bed6f207fc7c67815a4b33"
Output for 7.0.5
string(54) "97109cdb-68ff-3634e3-31323831-cf2b7bc898d5c96e2aab7472"
Output for 7.0.4
string(54) "a08748dc-640a-363436-313238e6-915778fc1aa85be3989527a6"
Output for 7.0.3
string(54) "4159a274-e849-3634c5-31323817-2e326a68646779b1ce6992ab"
Output for 7.0.2
string(54) "3c2f4546-3f21-363484-3132389c-289543e48aa0bcf3c32ece6b"
Output for 7.0.1
string(54) "54b9034b-efb4-363478-31323893-5cf5cf0711c45f5d471d0a8d"
Output for 7.0.0
string(54) "5f223f6c-439f-3634f9-31323849-441cb37897ae1775c4f8b852"
Output for 5.5.35 - 5.5.38, 5.6.0 - 5.6.7, 5.6.21 - 5.6.30
Fatal error: Call to undefined function RandomCompat_strlen() in /in/i0k74 on line 79
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.34, 5.6.8 - 5.6.20
Fatal error: Call to undefined function RandomCompat_strlen() in /in/i0k74 on line 36
Process exited with code 255.
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