ID: 35662 Updated by: [EMAIL PROTECTED] Reported By: jullrich at sans dot org -Status: Open +Status: Bogus Bug Type: *Math Functions Operating System: Linux 2.6 (RedHat) PHP Version: 4.4.1 New Comment:
The rand functions takes to integers as arguments when the second argument 9999999999 is cast to an integer it results in 1410065407. This is why you only get values starting with 10, 11, 12, 13 and 14 Previous Comments: ------------------------------------------------------------------------ [2005-12-13 22:29:29] jullrich at sans dot org 'rand' works fine up to 9 digits. I just did more tests and the bug only shows up for >= 10 digits. ------------------------------------------------------------------------ [2005-12-13 22:20:09] jullrich at sans dot org Getting the same problem with the php 5.1-latest. Code used to test: <?= # 1234567890 1234567890 rand(1000000000,9999999999); ?> Wrapper to generate 100 numbers: for b in `seq 1 100`; do php -e x.php >> numbers; done Quick summary of first two digits: 10... 21 times 11... 21 times 12... 13 times 13... 24 times 14... 3 times so still the same problem. Only numbers from 10... to 14... are generated. ------------------------------------------------------------------------ [2005-12-13 20:58:11] [EMAIL PROTECTED] Please try using this CVS snapshot: http://snaps.php.net/php5.1-latest.tar.gz For Windows: http://snaps.php.net/win32/php5.1-win32-latest.zip ------------------------------------------------------------------------ [2005-12-13 20:53:53] jullrich at sans dot org 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 this bug report at http://bugs.php.net/?id=35662&edit=1
