#35662 [NEW]: The 'rand()' function returns only few different values

From: jullrich at sans dot org Operating system: Linux 2.6 (RedHat) PHP version: 4.4.1 PHP Bug Type: *Math Functions Bug description: The 'rand()' function returns only few different values Description: ------------ The 'rand' function is far from random. For example, the following code: <?= rand(10000000000,99999999999); ?> only generates values that start with '12','13' or '14'. Out of 1500 times the function is called, only approx. 1000 different values are generated. Reproduce code: --------------- <?= rand(10000000000,99999999999); ?> Expected result: ---------------- somewhat random numbers between 10000000000 and 99999999999. Actual result: -------------- all numbers are in the range from 120000000000 to 150000000000 and frequently repeat (about 25% of the numbers are repeats). Sample: 1379409636 1275750426 1248288483 1398136354 1404047798 1292410973 1405794269 1278267510 1225653649 -- Edit bug report at http://bugs.php.net/?id=35662&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=35662&r=trysnapshot44 Try a CVS snapshot (PHP 5.1): http://bugs.php.net/fix.php?id=35662&r=trysnapshot51 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=35662&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=35662&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=35662&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=35662&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=35662&r=needscript Try newer version: http://bugs.php.net/fix.php?id=35662&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=35662&r=support Expected behavior: http://bugs.php.net/fix.php?id=35662&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=35662&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=35662&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=35662&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35662&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=35662&r=dst IIS Stability: http://bugs.php.net/fix.php?id=35662&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=35662&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=35662&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=35662&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=35662&r=mysqlcfg