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Bug #65212 problem if pass in numeric string containing a float between 0 and 1
Submitted: 2013-07-06 08:59 UTC Modified: 2020-12-07 12:09 UTC
Votes:2
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:2 (100.0%)
From: iam4webwork at hotmail dot com Assigned: cmb (profile)
Status: Not a bug Package: Math related
PHP Version: Irrelevant OS: Irrelevant
Private report: No CVE-ID: None
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 [2013-07-06 08:59 UTC] iam4webwork at hotmail dot com 
Description:
------------
If you pass to base_convert a numeric string like "0.5", to have it converted 
from base 10 to base 16, PHP will interpret the input as decimal 5 and return 
hexadecimal 5.  I suspect that the problem lies internally in the logic of 
_php_math_basetozval.

Test script:
---------------
var_dump(base_convert("0.5",10,16));

Expected result:
----------------
I expected PHP to return a zero just as printf("%x","0.5") and dexhex() do.

Actual result:
--------------
5

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 [2013-07-06 17:42 UTC] iam4webwork at hotmail dot com 
_php_math_basetozval appears to be source of problem b/c while it mimics strtol, 
unlike strtol it fails to adequately deal with '.' being an illegal character. 
strtol disregards '.' and all subsequent input whereas _php_math_basetozval just 
skips the '.' and processes the next character.
 [2020-12-07 12:09 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Assigned To: +Assigned To: cmb
 [2020-12-07 12:09 UTC] cmb@php.net 
That behaves as documented[1]:

| Any invalid characters in number are silently ignored. As of PHP
| 7.4.0 supplying any invalid characters is deprecated.

[1] <https://www.php.net/manual/en/function.base-convert.php#refsect1-function.base-convert-parameters>
 
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