#47901 [Opn->Bgs]: Need to define "large numbers" in base_convert limitations

ID: 47901 Updated by: vrana@php.net Reported By: exploringbinary at gmail dot com -Status: Open +Status: Bogus Bug Type: Documentation problem Operating System: Windows PHP Version: Irrelevant New Comment: There's a link to Floating point numbers. Previous Comments: ------------------------------------------------------------------------ [2009-04-05 14:24:17] exploringbinary at gmail dot com Description: ------------ The documentation for base_convert says "base_convert() may lose precision on large numbers...". Can you define exactly what "large number" is? Without knowing the limit, it's hard to trust the results. I know you can't specify a single limit, because it could vary by implementation. It still would be useful to define a limit for the most common implementations, like 32 bit unsigned integers or IEEE double floating-point. In the case of IEEE double floating-point, my guess is that the limit is 2^53, meaning that all integers less than or equal to 2^53 will be converted correctly. (All integers from 0 to 2^53 can fit in an IEEE double.) Related bug reports: Bug #23564 base_convert() ignores last character Bug #35874 base_convert is off on numbers greater than 13 decimal places ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=47901&edit=1