note 59937 added to function.md5

This is a nifty function to help in securing your web-forms. If no argument is passed the function will return an encrypted hex code representing the second it was called. If the same hex code is passed to the function it will return the number of seconds that have elapsed. The php script can then check the time between accessing the web-page and submitting the POST. This thwarts script ran web-form submissions. The program can verify a suitable period has elapsed for expected manual entries. The time check can be from 1 second to about 17 hours. The function requires the latest PEAR Blowfish Encryption module. This would go in the form: <?php print "<input type='hidden' value='" . FormTimer() . "' name='FormCode'>"; ?> This would go in the main php (post) script: <?php $seconds = FormTimer($_POST['FormCode']); if (($seconds < 10) || ($seconds > 1900)) { die "Your entry time took less than 10 seconds or more than 30 minutes"; } ?> Function... <?php function FormTimer($CodeID="") { require ('Blowfish.php'); require ('Blowfish/DefaultKey.php'); $key = "Secret^Word"; $bf = new Crypt_Blowfish($key); $current = substr(sprintf("%d", (time()+1)),-8); if (!$CodeID) { return bin2hex($bf->encrypt($current)); } $len = strlen($CodeID); $cValue = -1; for ($i=0;$i<$len;$i+=2) $Crypt.=chr(hexdec(substr($CodeID,$i,2))); if ($Crypt) { $time_called = $bf->decrypt($Crypt); if ($time_called) { $cValue = (intval($current) - intval($time_called)); } } return $cValue; } ?> ---- Manual Page -- http://www.php.net/manual/en/function.md5.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+59937 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+59937&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+59937&report=yes Search -- http://master.php.net/manage/user-notes.php