On 5 April 2011 16:28, Richard Quadling rquadl...@gmail.com wrote:
Hi.
I just wanted to quickly see if PHP supported ranges in its
switch/case statement (http://en.wikipedia.org/wiki/Ellipsis)
?php
$s = intval(date('s'));
switch($s)
{
case 0...9 : echo 'Between 0 and 9'; break;
case 10...19 : echo 'Between 10 and 19'; break;
case 20...29 : echo 'Between 20 and 29'; break;
case 30...39 : echo 'Between 30 and 39'; break;
case 40...49 : echo 'Between 40 and 49'; break;
case 50...59 : echo 'Between 50 and 59'; break;
default : echo 'Unknown : ', $s;
}
?
Completely unexpectedly, the above code runs but produces the wrong output.
Interestingly, altering the number of dots and adding spaces all
result in parse errors ...
case 0..9 : // 2 dots, no spaces
case 0 .. 9 : // 2 dots, with spaces
case 0 ... 9 : // 3 dots, with spaces
It was confusing that the initial code ran without a parse error, but
considering that it did, it would suggest that the case values are
actually meaningful in some way.
php -r var_dump(10...19);
Interesting output ...
string(6) 100.19
And that took me a little while to work out.
It's all to do with PHP's type juggling.
10...19
What I'm not sure is why the middle empty string is output as 0.
10 . . .19 becomes 10 . 0 . .19 which becomes 100.19
Oddly, more . don't work.
php -r var_dump(1019);
all result in parse errors.
I don't know if this is a bug per se, but it is an oddity that I
though I'd share.
And what is even more surprising is that the initial code works in the
PHP V4.0.0. So maybe an 11 years old bug.
You really would have thought I'd have more to do with my time!
Regards,
Richard.
Just tested PHP V3.0.11 and I get the same response.
Seems that this is just the way it is.
An oddity for since 1999-06-26 at least.
Richard.
--
Richard Quadling
Twitter : EE : Zend
@RQuadling : e-e.com/M_248814.html : bit.ly/9O8vFY
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