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: ------------------------------------------------------------------------ [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 '' ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=28899&edit=1