From:             
Operating system: any
PHP version:      5.4.0alpha2
Package:          mbstring related
Bug Type:         Feature/Change Request
Bug description:return proper FALSE value when mb_substr parameters are not 
computable

Description:
------------
hi, it is possible to make mb_substr work exactly like substr?

substr("",0,10) // returns false
mb_substr("",0,10) // returns ""

substr("abc",7,1) // returns false
mb_substr("abc",7,1) // returns ""

thank you


-- 
Edit bug report at https://bugs.php.net/bug.php?id=55241&edit=1
-- 
Try a snapshot (PHP 5.2):            
https://bugs.php.net/fix.php?id=55241&r=trysnapshot52
Try a snapshot (PHP 5.3):            
https://bugs.php.net/fix.php?id=55241&r=trysnapshot53
Try a snapshot (trunk):              
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Fixed in SVN:                        
https://bugs.php.net/fix.php?id=55241&r=fixed
Fixed in SVN and need be documented: 
https://bugs.php.net/fix.php?id=55241&r=needdocs
Fixed in release:                    
https://bugs.php.net/fix.php?id=55241&r=alreadyfixed
Need backtrace:                      
https://bugs.php.net/fix.php?id=55241&r=needtrace
Need Reproduce Script:               
https://bugs.php.net/fix.php?id=55241&r=needscript
Try newer version:                   
https://bugs.php.net/fix.php?id=55241&r=oldversion
Not developer issue:                 
https://bugs.php.net/fix.php?id=55241&r=support
Expected behavior:                   
https://bugs.php.net/fix.php?id=55241&r=notwrong
Not enough info:                     
https://bugs.php.net/fix.php?id=55241&r=notenoughinfo
Submitted twice:                     
https://bugs.php.net/fix.php?id=55241&r=submittedtwice
register_globals:                    
https://bugs.php.net/fix.php?id=55241&r=globals
PHP 4 support discontinued:          
https://bugs.php.net/fix.php?id=55241&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=55241&r=dst
IIS Stability:                       
https://bugs.php.net/fix.php?id=55241&r=isapi
Install GNU Sed:                     
https://bugs.php.net/fix.php?id=55241&r=gnused
Floating point limitations:          
https://bugs.php.net/fix.php?id=55241&r=float
No Zend Extensions:                  
https://bugs.php.net/fix.php?id=55241&r=nozend
MySQL Configuration Error:           
https://bugs.php.net/fix.php?id=55241&r=mysqlcfg
Try a snapshot (PHP 5.4):            
https://bugs.php.net/fix.php?id=55241&r=trysnapshot54

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