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发信人: thinkin (强强), 信区: Linux
标  题: RandomDigits
发信站: BBS 水木清华站 (Thu Feb 17 11:06:50 2000)

<?php
/* RandomDigit 1.0 -- Copyright 1998 by Michael A. Smith -- msmith@dn.net
This function returns a random string of a specified number of digits
without leading zeros. For example, if three digits are specified, the
function will return a random three-digit number from 100 to 999. If you
specify an eight-digit string you will not get numbers with fewer than
eight digits, e.g. 376 or 6. */
function randomdigit($digits) {
   static $startseed = 0;
   if (!$startseed) {
      $startseed = (double)microtime()*getrandmax();
      srand($startseed);
   }
   $range = 8;
   $start = 1;
   $i = 1;
   while ($i<$digits) {
      $range = $range . 9;
      $start = $start . 0;
      $i++;
   }
   return (rand()%$range+$start);
}
?>
--

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