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Date: Thu, 18 Dec 2008 22:22:05 +0000
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To: Dave Ingram <dave@dmi.me.uk>
CC: Giorgio Sironi <piccoloprincipeazzurro@gmail.com>, 
 internals@lists.php.net
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Subject: Re: [PHP-DEV] Q on Primitives
From: nrixham@gmail.com (Nathan Rixham)

Dave Ingram wrote:
>> I remember that multiple signatures was said to have a possible very
>> difficult implementation. However, a similar behaviour can be achieved by
>> some instanceof().
>>   
>>     
> I thought it probably would be awkward, but we do already have some type
> hinting that can also be accomplished with instanceof() -- this is just
> an extension of that idea. Although it's not my idea as such!
>
>   
instance of is handy however it isn't the cleanest; consider:

public static function parseByte( $var )
    {
        $testPassed = false;
        if( $var instanceof Number ) {
            $var = $var->byteValue();
            $testPassed = true;
        } if( $var instanceof String ) {
            $var = $var->__toString();
        }
        if( !$testPassed && is_numeric( $var ) ) {
            $var = 0 + $var;
            $testPassed = true;
        }
        if( $testPassed && Byte::MIN_VALUE <= $var && Byte::MAX_VALUE >= 
$var ) {
            return $var;
        }
        throw new NumberFormatException();
    }

could be:

public static function parseByte( Number $var )
    {
        return $var->byteValue();
    }

public static function parseByte( String $var )
    {
        if( is_numeric( $var = $var->__toString() ) ) {
          $var = 0 + $var;
          if( Byte::MIN_VALUE <= $var && Byte::MAX_VALUE >= $var ) {
            return $var;
          }
        }
        throw new NumberFormatException();
    }

mini-use-case but shows how useful it would be..