[PHP] reversing an IF statement
Often I end up using a dumb IF statement which to me seems that
it could have been done some other way.
Example :
if(
($_GET[id]==1) or
($_GET[mode]==home) or
((!isset($_GET[item])) ($_GET[mode]==news))
) {
// Here we do nothing
} else {
// This is where we do it
}
If we translate the above to simpler reading we could say :
if(statement)
// skip
else
// Do the stuff
I'm ofcourse looking for this
if(!statement)
// Do the stuff
Problem is, when using more statements I never seem to find the
way of doing it without having an empty {} in it, dont know if you
see my problem here however, its the best I can exmplain.
For all I know it has to be like this.
--
--
Kim Steinhaug
--
There are 10 types of people when it comes to binary numbers:
those who understand them, and those who don't.
--
www.steinhaug.com - www.easywebshop.no - www.webkitpro.com
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RE: [PHP] reversing an IF statement
The easiest method is just to encase all the checks in parenthese, then
negate it:
if(!(
($_GET[id]==1) or
($_GET[mode]==home) or
((!isset($_GET[item])) ($_GET[mode]==news))
)) {
// This is where we do it
}
-Original Message-
From: Kim Steinhaug [mailto:[EMAIL PROTECTED]
Sent: Saturday, May 01, 2004 3:29 AM
To: [EMAIL PROTECTED]
Subject: [PHP] reversing an IF statement
Often I end up using a dumb IF statement which to me seems that
it could have been done some other way.
Example :
if(
($_GET[id]==1) or
($_GET[mode]==home) or
((!isset($_GET[item])) ($_GET[mode]==news))
) {
// Here we do nothing
} else {
// This is where we do it
}
If we translate the above to simpler reading we could say :
if(statement)
// skip
else
// Do the stuff
I'm ofcourse looking for this
if(!statement)
// Do the stuff
Problem is, when using more statements I never seem to find the
way of doing it without having an empty {} in it, dont know if you
see my problem here however, its the best I can exmplain.
For all I know it has to be like this.
--
--
Kim Steinhaug
--
There are 10 types of people when it comes to binary numbers:
those who understand them, and those who don't.
--
www.steinhaug.com - www.easywebshop.no - www.webkitpro.com
--
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] reversing an IF statement
* Thus wrote Kim Steinhaug ([EMAIL PROTECTED]):
Often I end up using a dumb IF statement which to me seems that
it could have been done some other way.
Example :
if(
($_GET[id]==1) or
($_GET[mode]==home) or
((!isset($_GET[item])) ($_GET[mode]==news))
For starters, don't intermatch 'OR' with , the have different
precedence's and can lead to unexpected behaviour. The proper 'OR'
that should be used is ||. see: http://php.net/operators
Here is an approach I use to avoid making the if statement real
complicated and kinda makes it more understandable what you are
trying to accomplish with the condition:
$is_ok = $_GET[id] == 1 ||
$_GET[mode] == home ||
(!isset($_GET[item]) $_GET[mode] == news));
if (! is_ok ) {
// yada...
}
Curt
--
I used to think I was indecisive, but now I'm not so sure.
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