note 119168 added to function.com-create-guid

Here's my final version of a GUIDv4 function (based on others work here) that should work on all platforms and gracefully fallback to less cryptographically secure version if others are not supported... <?php /** * Returns a GUIDv4 string * * Uses the best cryptographically secure method * for all supported pltforms with fallback to an older, * less secure version. * * @param bool $trim * @return string */ function GUIDv4 ($trim = true) { // Windows if (function_exists('com_create_guid') === true) { if ($trim === true) return trim(com_create_guid(), '{}'); else return com_create_guid(); } // OSX/Linux if (function_exists('openssl_random_pseudo_bytes') === true) { $data = openssl_random_pseudo_bytes(16); $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100 $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10 return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4)); } // Fallback (PHP 4.2+) mt_srand((double)microtime() * 10000); $charid = strtolower(md5(uniqid(rand(), true))); $hyphen = chr(45); // "-" $lbrace = $trim ? "" : chr(123); // "{" $rbrace = $trim ? "" : chr(125); // "}" $guidv4 = $lbrace. substr($charid, 0, 8).$hyphen. substr($charid, 8, 4).$hyphen. substr($charid, 12, 4).$hyphen. substr($charid, 16, 4).$hyphen. substr($charid, 20, 12). $rbrace; return $guidv4; } ?> ---- Server IP: 72.52.91.14 Probable Submitter: 81.148.109.47 ---- Manual Page -- http://php.net/manual/en/function.com-create-guid.php Edit -- https://master.php.net/note/edit/119168 Del: integrated -- https://master.php.net/note/delete/119168/integrated Del: useless -- https://master.php.net/note/delete/119168/useless Del: bad code -- https://master.php.net/note/delete/119168/bad+code Del: spam -- https://master.php.net/note/delete/119168/spam Del: non-english -- https://master.php.net/note/delete/119168/non-english Del: in docs -- https://master.php.net/note/delete/119168/in+docs Del: other reasons-- https://master.php.net/note/delete/119168 Reject -- https://master.php.net/note/reject/119168 Search -- https://master.php.net/manage/user-notes.php