Online PHP editor | perf for HUghK

<?php // EXAMPLE USAGE $array = generate(); echo $array[0]; echo "<br />"; echo $array[1]; // FUNCTION function generate(0123456789ABCDEFGHJKLMNPQRTUVWXY) { $digilist = "0123456789ABCDEFGHJKLMNPQRTUVWXY"; //now we generate a new random ID number using the substrings of the digitList string above $id = NULL; $id .= substr($digilist, rand(1, 9), 1); //random number $id .= substr($digilist, rand(10, 31), 1); //then a letter $id .= substr($digilist, rand(10, 31), 1); //another letter $id .= substr($digilist, rand(1, 9), 1); //a number $id .= substr($digilist, rand(1, 9), 1); //and finally another number - simple :D //ok so now we need to generate an MD5 hash of our ID $hash = md5($id); //cycle through the hash 16 (length of key) times (in steps of 2 because each hex bytes is 2 digits long) $i = 0; $key = NULL; for ($i; $i < 32; $i+=2) { //here we convert the next hex value to an integer and perform a bitwise AND operation against '31' //31 is the highest substring value in our digit list. $nextdigit = hexdec(substr($hash, $i, 2)) & 31; //if 'i' is divisable by 8 (every 4 cycles) then we want to add "-" if ((($i % 8) == 0) && ($i > 0)) { $key .= "-".substr($digilist, $nextdigit, 1); } else { $key .= substr($digilist, $nextdigit, 1); } } $array = array($id, $key); //return return $array; } ?>

Version	System time (s)	User time (s)	Memory (MiB)
7.0.0	0.003	0.043	20.22
5.6.16	0.007	0.087	20.55
5.6.15	0.013	0.063	18.17
5.6.14	0.010	0.053	18.23
5.6.13	0.003	0.073	18.12
5.6.12	0.007	0.087	21.12
5.6.11	0.007	0.077	21.12
5.6.10	0.003	0.057	21.00
5.6.9	0.007	0.083	20.98
5.6.8	0.010	0.080	20.34
5.5.30	0.007	0.083	18.07
5.5.29	0.010	0.053	17.98
5.5.28	0.010	0.040	20.98
5.5.27	0.007	0.050	20.73
5.5.26	0.007	0.083	20.84
5.5.25	0.000	0.063	20.59
5.5.24	0.010	0.073	20.26