note 79439 added to function.pcntl-fork

Here is an interesting script I wrote. It demonstrates how pcntl_fork() might be used as a useful tool. <?php /* This script serves the purpose of testing an algorithm designed to: a.) Compare password hashes, or try passwords efficiently where the time to try a single password is 10 seconds. b.) Spawn threads to work simultaneously on comparing hashes. c.) Restrict the number of threads open at a time. */ //checks for divisibility function divby($num,$den) { $result = $num/$den; $result2 = floor($result); if ($result == $result2) { return true; } else { return false; } } //checks whether a period of time fits into 2 second intervals occuring every 10 seconds. Interval may increase or decrease in size to use more or less memory. function goodTime($elapsed) { $num = floor($elapsed); $num = $num/12; $min = floor($num); $min = 12*$min; $max = $min+2; if ($elapsed >= $min && $elapsed <= $max) { return "yes"; } else { return "no"; } } $x = 30; //number of child threads $pid = 1; //needed to create first thread $xpass = md5('29');//hash to crack $time = time(); $i = 1; //parent spawns $x children. while ($i <= $x) { if (file_exists('childcall.txt')) { unlink('childcall.txt'); exit; } $elapsed = time()-$time; //children are only spawned during intervals occuring every 10 seconds leaving enough time for the previous batch of children to finish their task. if (goodTime($elapsed)=="yes") { //Are we the parent? if ($pid != 0) { //Give birth to a child. $pid = pcntl_fork(); //create a record of how many children have been birthed. $arr[$i] = $i; $time2 = $elapsed; } //escort children out of the loop. if ($pid == 0) { $i = $x+1; } $i++; } } //parent waits for children to finish playing. if ($pid) { $value = 1; while (!file_exists('childcall.txt')) { //wait } unlink('childcall.txt'); $time = time()+2; while (time()<$time) { //wait } exit; } //children take turns finding the highest array value, and changing it to 0 rsort($arr); $value = max($arr); $arr[$value] = 0; $time = time()+10; //simulate delay while (time() < $time) { //wait } //compare the high array value hash to the hash we are looking to crack. if (md5($value) == $xpass) { echo "$value \n"; } if ($value == $x || md5($value) == $xpass) { $file = "childcall.txt"; $content = true; file_put_contents($file,$contents); } ?> ---- Server IP: 69.147.83.197 Probable Submitter: 75.92.10.62 ---- Manual Page -- http://www.php.net/manual/en/function.pcntl-fork.php Edit -- https://master.php.net/note/edit/79439 Del: integrated -- https://master.php.net/note/delete/79439/integrated Del: useless -- https://master.php.net/note/delete/79439/useless Del: bad code -- https://master.php.net/note/delete/79439/bad+code Del: spam -- https://master.php.net/note/delete/79439/spam Del: non-english -- https://master.php.net/note/delete/79439/non-english Del: in docs -- https://master.php.net/note/delete/79439/in+docs Del: other reasons-- https://master.php.net/note/delete/79439 Reject -- https://master.php.net/note/reject/79439 Search -- https://master.php.net/manage/user-notes.php