Edit report at https://bugs.php.net/bug.php?id=61220&edit=1
ID: 61220
User updated by: dosergio at ig dot com dot br
Reported by: dosergio at ig dot com dot br
Summary: is_numeric returns FALSE for chr(0) and CHR(1) that
are BIT, so NUMERIC.
Status: Not a bug
Type: Bug
Package: *General Issues
Operating System: ALL
PHP Version: Irrelevant
Block user comment: N
Private report: N
New Comment:
Do you know the binary numeric system ?
Chr(0) is the octet 00000000 which value is 0, so it's NOT different from zero.
Chr(1) is the octet 00000001 which value is 1, NOT different from the numeric 1.
These two chars should ALSO be recognized as boolean in the "is_bool" function
too. Everybody that program in C knows that 0 and 1 are the real booleans
inside the engine.
If you are so sure, take the chance, and tell the MySQL team that they are
wrong, because they are storing chr(0) and chr(1) for bit(1) values.
Bit is defined as numeric data type in MySQL
Previous Comments:
------------------------------------------------------------------------
[2012-03-01 15:45:58] ras...@php.net
No, definitely not. chr(0) is a NUL which is distinct from the number 0 and
chr(1) is a SOH character which has absolutely nothing to do with a number.
------------------------------------------------------------------------
[2012-03-01 15:02:02] dosergio at ig dot com dot br
I also tested chr(0) and chr(1) with is_boolean and of course the function says
it is not.
I think is_numeric and is_boolean should be revised to include 0, 1, chr(0) and
chr(1) as valid numeric and valid booleans.
------------------------------------------------------------------------
[2012-03-01 14:13:56] dosergio at ig dot com dot br
if( is_numeric( chr(0)) && is_numeric(chr(1)) ) # <-- changed to &&
echo "is_numeric is great!";
else
echo "is_numeric might be a little buggy";
------------------------------------------------------------------------
[2012-03-01 14:12:13] dosergio at ig dot com dot br
Description:
------------
I think that is_numeric should return TRUE if you pass chr(0) or chr(1) to it
because this chars are stored in database as BITs, that are numeric in the
binary context. Would php adopt it ?
I had to use a strange conditional because of this supposed "bug":
[code]
if( is_numeric($myvar) || ord($myvar) < 2) {
# to check char 0 or 1 that are BITS, binary numeric.
}
[/code]
Test script:
---------------
if( is_numeric( chr(0)) || is_numeric(chr(1)) )
echo "is_numeric is great!";
else
echo "is_numeric might be a little buggy";
Expected result:
----------------
is_numeric shoud recognize chr(0) and chr(1) as numeric, as they are chars for
bit information.
Actual result:
--------------
is_numeric says chr(0) and chr(1) are both NOT numeric.
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=61220&edit=1
