note 95683 added to function.mt-rand

The following function generates a string of arbitrary length (with limitations), composed of random PHP characters (i.e. each an 8-bit value - a byte). Suitable for generating random session strings. Encode as Base64 to transmit over network, where required. ** The function is pretty much one of the fastest (if not THE fastest) methods of generating random strings, as opposed to numerous examples given on this page which go about with char-by-char generation. Sloppy benchmarks estimate a factor of 10 speedup. Keep your websites lean, people. ** The only thing to keep in mind is that, by design, it outputs 8-bit characters, and thus the generated string is not automatically suitable for transmission with various network protocols, unless altered, f.e. URL- or Base64- encoded. Also, again by design, the length of the string is a multiple of 4 characters/bytes. The version below produces a 24 character long string. This will also give you a clean input to get a 32 character long Base64 encoded variant of it. <?php function gen_rand_str_24() { return pack('N6', mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand(), mt_rand()); } ?> I leave it an exercise to the reader to write a generic (i.e. arbitrary double word length, not 6 dwords as in above) version of it. ---- Server IP: 128.39.198.38 Probable Submitter: 217.14.4.149 ---- Manual Page -- http://www.php.net/manual/en/function.mt-rand.php Edit -- https://master.php.net/note/edit/95683 Del: integrated -- https://master.php.net/note/delete/95683/integrated Del: useless -- https://master.php.net/note/delete/95683/useless Del: bad code -- https://master.php.net/note/delete/95683/bad+code Del: spam -- https://master.php.net/note/delete/95683/spam Del: non-english -- https://master.php.net/note/delete/95683/non-english Del: in docs -- https://master.php.net/note/delete/95683/in+docs Del: other reasons-- https://master.php.net/note/delete/95683 Reject -- https://master.php.net/note/reject/95683 Search -- https://master.php.net/manage/user-notes.php