Bug #76884 [NEW]: base_convert restore data not equal origin data

From: aston dot seal at gmail dot com Operating system: centos 7.4 PHP version: 7.2.10 Package: *General Issues Bug Type: Bug Bug description:base_convert restore data not equal origin data Description: ------------ --- From manual page: http://www.php.net/function.base-convert --- PHP Version : PHP 7.2.10 (cli) (built: Sep 11 2018 10:09:51) ( NTS ) when I using base_convert to make a order id for my system, I found it restore my data isn't correct, is it a bug ? origin_data always not equal recovery_data Test script: --------------- $a = '10010'.sprintf('%02d',mt_rand(0,99)).str_pad(str_replace('.', '', microtime(TRUE)), 14, 0, STR_PAD_RIGHT); echo 'origin_data : '.$a; echo '<br>'; $b = base_convert($a, 10,36); echo 'convert_data : '.$b; echo '<br>'; echo 'recovery_data : '.base_convert($b, 36,10); Expected result: ---------------- origin_data : 100106615369813329847 convert_data : l4k9ti8ikb4cg recovery_data : 100106615369813329847 Actual result: -------------- origin_data : 100106615369813329847 convert_data : l4k9ti8ikb4cg recovery_data : 100106615369813328882 -- Edit bug report at https://bugs.php.net/bug.php?id=76884&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=76884&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=76884&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=76884&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=76884&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=76884&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=76884&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=76884&r=needscript Try newer version: https://bugs.php.net/fix.php?id=76884&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=76884&r=support Expected behavior: https://bugs.php.net/fix.php?id=76884&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=76884&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=76884&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=76884&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=76884&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=76884&r=dst IIS Stability: https://bugs.php.net/fix.php?id=76884&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=76884&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=76884&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=76884&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=76884&r=mysqlcfg