From:             
Operating system: Irrelevant
PHP version:      5.3.10
Package:          Strings related
Bug Type:         Bug
Bug description:htmlspecialchars() optional parameters and null

Description:
------------
One would expect that when the optional $flags of htmlspecialchars() is set
to null, the behavior is the same as when the parameter is not set, so the
default value is used.

This would be useful when someone wants to set another optional parameter.
For instance, to set the $double_encode parameter:
    htmlspecialchars("some text", null, null, false);

Comment:
This is a bug similar to #40531 "mb_substr optional parameters". Other
functions probably behave the same. The difficulty is that
zend_parse_argument() cannot deal with the complex type "long or null", so
extra parsing and validating is needed.
First tested on PHP 5.3.10, but same problem on 5.4.0.

Test script:
---------------
echo htmlspecialchars("l'été \"dernier\"\n");
echo htmlspecialchars("l'été \"dernier\"\n", null);
echo htmlspecialchars("l'été \"dernier\"\n", 0);

Expected result:
----------------
l'été "dernier"
l'été "dernier"
l'été "dernier"

Actual result:
--------------
l'été "dernier"
l'été "dernier"
l'été "dernier"

-- 
Edit bug report at https://bugs.php.net/bug.php?id=61498&edit=1
-- 
Try a snapshot (PHP 5.4):            
https://bugs.php.net/fix.php?id=61498&r=trysnapshot54
Try a snapshot (PHP 5.3):            
https://bugs.php.net/fix.php?id=61498&r=trysnapshot53
Try a snapshot (trunk):              
https://bugs.php.net/fix.php?id=61498&r=trysnapshottrunk
Fixed in SVN:                        
https://bugs.php.net/fix.php?id=61498&r=fixed
Fixed in SVN and need be documented: 
https://bugs.php.net/fix.php?id=61498&r=needdocs
Fixed in release:                    
https://bugs.php.net/fix.php?id=61498&r=alreadyfixed
Need backtrace:                      
https://bugs.php.net/fix.php?id=61498&r=needtrace
Need Reproduce Script:               
https://bugs.php.net/fix.php?id=61498&r=needscript
Try newer version:                   
https://bugs.php.net/fix.php?id=61498&r=oldversion
Not developer issue:                 
https://bugs.php.net/fix.php?id=61498&r=support
Expected behavior:                   
https://bugs.php.net/fix.php?id=61498&r=notwrong
Not enough info:                     
https://bugs.php.net/fix.php?id=61498&r=notenoughinfo
Submitted twice:                     
https://bugs.php.net/fix.php?id=61498&r=submittedtwice
register_globals:                    
https://bugs.php.net/fix.php?id=61498&r=globals
PHP 4 support discontinued:          
https://bugs.php.net/fix.php?id=61498&r=php4
Daylight Savings:                    https://bugs.php.net/fix.php?id=61498&r=dst
IIS Stability:                       
https://bugs.php.net/fix.php?id=61498&r=isapi
Install GNU Sed:                     
https://bugs.php.net/fix.php?id=61498&r=gnused
Floating point limitations:          
https://bugs.php.net/fix.php?id=61498&r=float
No Zend Extensions:                  
https://bugs.php.net/fix.php?id=61498&r=nozend
MySQL Configuration Error:           
https://bugs.php.net/fix.php?id=61498&r=mysqlcfg

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