Yes, that's a golden rule for a bug free code.
The rule shoudl be something like this...

Whenever you have a constant value evaluated to a non-constant value
put them in the left side of the expression.

if( 'constant' == $non_constant )
    echo ' variables has that name for anything ';

if( false !== ( $pos = strpos( 'php', 'I love php sintax' )))
    echo ' we all love it ';

Also note that is easy to count the closing parenthesis
(if your editor does not helps try with SciTE)

On Wed, Aug 5, 2009 at 6:55 PM, Ben Dunlap<> wrote:
>> In my navigation.php include file, I had if ($page = about) echo href....
>> I changed it to if ($page == about) echo.... and it suddenly worked! Imagine
>> that...
> Another good case for putting the variable on the right side of "==":
>   if ("about" == $page)
> Then if you mis-type "==" as "=", PHP will fail immediately with a parse 
> error.
> It feels a little weird but if it saves a lot of head-desk moments it's
> probably worth it. Now if only I could get into the habit myself...
> Ben
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Martin Scotta

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