Weird. View as Markdown

I know that this issue to some extent or another has been brought up
before, but I just wanted to make sure that this is really how things
are supposed to work... Apparently the statements setting B C and D
are all equivalent.

This could be absolutely bogus, but I thought maybe someone could
explain briefly why if it is :)

"B" and "C" are equivalent but "D" is somethig else.

"B" and "C" set the property named by the value of $myvar.
in "D" the variable-name is '$myvar' (not 'myvar').

if you set

$myvar = "foo";
${'$myvar'} = "bar";

then "B" and "C" will set $this->foo, but "D" will set $this->bar.

it's not that bogus.

greetings
messju

John

<?php
class weird {

          var $myvar;

          function __construct() {

          $this->myvar = "A";
          $this->$myvar = "B";
          $this->${'myvar'} = "C";
          $this->${'$myvar'} = "D";

          echo 'this->myvar: '.$this->myvar."\n";
          echo 'this->$myvar: '.$this->$myvar."\n";
          echo 'this->${\'myvar\'}: '.$this->${'myvar'}."\n";
          echo 'this->${\'$myvar\'}: '.$this->${'$myvar'}."\n";
          echo 'this->$$$$$$$myvar: '.$this->$$$$$$$myvar."\n";
          echo 'this->$$$$$$${\'$$$myvar\'}: ' . 
                $this->$$$$$$${'$$$myvar'}."\n";

         }
    }

?>

-=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=-
John Coggeshall http://www.coggeshall.org/
The PHP Developer's Handbook http://www.php-handbook.com/
-=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=--=~=

At 11:33 14/01/2004, John Coggeshall wrote:

I know that this issue to some extent or another has been brought up
before, but I just wanted to make sure that this is really how things
are supposed to work... Apparently the statements setting B C and D
are all equivalent.

This could be absolutely bogus, but I thought maybe someone could
explain briefly why if it is :)

John

<?php
class weird {

          var $myvar;

          function __construct() {

          $this->myvar = "A";
          $this->$myvar = "B";
          $this->${'myvar'} = "C";
          $this->${'$myvar'} = "D";

          echo 'this->myvar: '.$this->myvar."\n";
          echo 'this->$myvar: '.$this->$myvar."\n";
          echo 'this->${\'myvar\'}: '.$this->${'myvar'}."\n";
          echo 'this->${\'$myvar\'}: '.$this->${'$myvar'}."\n";
          echo 'this->$$$$$$$myvar: '.$this->$$$$$$$myvar."\n";
          echo 'this->$$$$$$${\'$$$myvar\'}: ' .
                $this->$$$$$$${'$$$myvar'}."\n";

         }
    }

?>

I don't see anything odd in here. All of the assignments, except for the
first one ('A'), assign to $this->"" (because $myvar, ${'myvar'} (which is
the same as $myvar) and ${'$myvar'} (which is basically $"") are all non
existent variables which implicitly evaluate to "". Try to turn on E_ALL,
it should give you some insight...

Zeev