On 8 June 2010 16:53, Ashley Sheridan <ash@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, 2010-06-08 at 16:44 +0200, Peter Lind wrote: > > On 8 June 2010 16:38, Ashley Sheridan <ash@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, 2010-06-08 at 10:35 -0400, Paul M Foster wrote: > > > >> On Tue, Jun 08, 2010 at 09:38:58AM -0400, Robert Cummings wrote: > >> > >> > Tanel Tammik wrote: > >> >> Hi, > >> >> > >> >> which one is correct or "better"? > >> >> > >> >> $array[3] = ''; > >> >> or > >> >> $array['3'] = ''; > >> >> > >> >> $i = 7; > >> >> > >> >> $array[$i] = ''; > >> >> or > >> >> $array["$i"] = ''; > >> > > >> > Sometimes it is good to illustrate the correct answer: > >> > > >> > <?php > >> > > >> > $array = array > >> > ( > >> > '1' => '1', > >> > '2' => '2', > >> > 'three' => 'three', > >> > '4.0' => '4.0', > >> > 5.0 => 5.0, > >> > ); > >> > > >> > var_dump( array_keys( $array ) ); > >> > > >> > ?> > >> > > >> > The answer is surprising (well, not really :) and certainly advocates > >> > against making literal strings of integers or manually converting a > >> > string integer to a real integer or using floating point keys. > >> > >> Curse you, Rob Cummings! ;-} > >> > >> I was stunned at the results of this. I assumed that integers cast as > >> strings would remain strings as indexes. Not so. And then float indexes > >> cast to ints. Argh! > >> > >> My advice to the original poster was slightly incorrect. But I would > >> still encourage you to avoid enclosing variables in double-quotes > >> unnecessarily. (And integers in single-quotes for that matter.) > >> > >> Paul > >> > >> -- > >> Paul M. Foster > >> > > > > > > The obvious way around this would be to include some sort of character > > in the index that can't be cast to an integer, so instead of $array[1.0] > > which would equate to $array[1] maybe add an underscore to make it > > $array['_1.0']. It's not the prettiest of solutions, but it does mean > > that indexes are kept as you intended, and you need only strip out the > > first character, although I imagine a lot of string manipulation on a > > large array would decrease performance. > > Floats in quotes are not cast to int when used as array keys. Just an FYI :) > > Regards > Peter > > > They are. Go look at Robs earlier example. Even building upon that to make a float value where it doesn't equate to an integer, it is still cast as an integer unless it's inside a string: > > $array = array > ( > '1' => '1', > '2' => '2', > 'three' => 'three', > '4.0' => '4.0', > 5.0 => 5.0, > 6.5 => 6.5, > ); > > var_dump( array_keys( $array ) ); > > That's Robs code, but I added in the last element to show how a float index is converted to an integer. Putting the float value inside a string solves the issue. > Did you read what I wrote? > ***Floats in quotes*** are not cast to int when used as array keys. Just an FYI :) I tested Robs example, that's how I know that floats in quotes are not converted to ints, whether or not you use '4.0' or '6.5' Regards Peter -- <hype> WWW: http://plphp.dk / http://plind.dk LinkedIn: http://www.linkedin.com/in/plind BeWelcome/Couchsurfing: Fake51 Twitter: http://twitter.com/kafe15 </hype> -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
