#40296 [NEW]: "unless" control structure

From: Date: Wed, 31 Jan 2007 12:26:42 +0000
Subject: #40296 [NEW]: "unless" control structure
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-108275@lists.php.net to get a copy of this message 
From:             mail at tobyinkster dot co dot uk
Operating system: All
PHP version:      5.2.0
PHP Bug Type:     Feature/Change Request
Bug description:  "unless" control structure

Description:
------------
It would be nice if PHP had an "unless" control structure so that:

    unless (...) { ... }

would be equivalent to:

    if (!(...)) { ... }

Although the "unless" control structure is actually slightly more verbose
(in bytes) than "if", it is arguably a lot more readable in the following
examples:

    unless ($a==0 || $b==0)
        divide_by($a*$b);

versus:

    if (!($a==0 || $b==0))
        divide_by($a*$b);

or, equivalently using De Morgan's Law (Google for it):

    if ($a!=0 && $b!=0)
        divide_by($a*$b);

The "unless" structure uses less punctuation, and more human syntax. I
can't imagine how this extra syntax would break any existing scripts.

For what it's worth, Perl already has an "unless" control structure.


-- 
Edit bug report at http://bugs.php.net/?id=40296&edit=1
-- 
Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=40296&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=40296&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=40296&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=40296&r=fixedcvs
Fixed in release:             http://bugs.php.net/fix.php?id=40296&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=40296&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=40296&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=40296&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=40296&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=40296&r=notwrong
Not enough info:              http://bugs.php.net/fix.php?id=40296&r=notenoughinfo
Submitted twice:              http://bugs.php.net/fix.php?id=40296&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=40296&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=40296&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=40296&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=40296&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=40296&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=40296&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=40296&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=40296&r=mysqlcfg

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