ID: 28899
User updated by: mauroi at digbang dot com
Reported By: mauroi at digbang dot com
Status: Open
Bug Type: mbstring related
Operating System: *
PHP Version: 4CVS, 5CVS (2004-12-12)
Assigned To: moriyoshi
New Comment:
just to mention it... lot of code written with the mb_* function
overload relies on substr returning a zero length string... changing
substr to work like mb_substr won't break anything (i think)
Previous Comments:
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[2004-12-20 10:28:55] [EMAIL PROTECTED]
The very nature of "substr" is that the function returns
the specified part of the string whenever the range is
valid and returns an error status if it is out of range.
If a null string is a valid string entity, then it
should be able to be referred to by index "0" and thus
the implementation returns a null string instead of
false. Or you would say this isn't really logical? :)
------------------------------------------------------------------------
[2004-12-15 04:19:11] [EMAIL PROTECTED]
The correct quote from up-to-date manual:
"If string is less than or equal to start characters long, FALSE will
be returned."
Notice the 'or equal' there?
Thus logically mb_substr() is buggy.
------------------------------------------------------------------------
[2004-06-23 22:12:57] [EMAIL PROTECTED]
Good catch. Logically it seems substr() is wrong and mb_substr() is
correct.
------------------------------------------------------------------------
[2004-06-23 21:21:51] mauroi at digbang dot com
Description:
------------
if I make the following call I get FALSE.
var_dump(substr('', 0));
The documentation says "If string is less than start characters long,
FALSE will be returned".
That can be very ambiguous because start is 0 and the length of the
string is 0 (not less).
Another problem: mb_substr does not work like this. If you overload
the
functions and make the same call as above it will return an empty
string.
Thanks in advance.
Reproduce code:
---------------
var_dump(substr('', 0));
var_dump(mb_substr('', 0));
Expected result:
----------------
''
''
Or
FALSE
FALSE
Actual result:
--------------
FALSE
''
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Edit this bug report at http://bugs.php.net/?id=28899&edit=1
