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Request #49367 Automatic type casting for the variable function name
Submitted: 2009-08-26 02:57 UTC Modified: 2009-11-02 11:36 UTC
Votes:2
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: kexianbin at diyism dot com Assigned:
Status: Wont fix Package: Feature/Change Request
PHP Version: 5.3.1 OS: Linux
Private report: No CVE-ID: None
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From: kexianbin at diyism dot com
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 [2009-08-26 02:57 UTC] kexianbin at diyism dot com 
Description:
------------
Currently, php 5.3.0 doesn't support automatic type casting for the variable function name, we indeed need it, it could lead to very cool applications.

Reproduce code:
---------------
<?
class cls_so_work
      {function __toString()
                {return 'so_work';
                }
      }
function so_work()
         {echo 'hello';
         }

$o=new cls_so_work;
echo $o.'<br>';
$o();
?>

Expected result:
----------------
so_work
hello

Actual result:
--------------
so_work
Fatal error: Function name must be a string in E:\WWW\PhpApps\test\test.php on line 18

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 [2009-08-26 03:02 UTC] kexianbin at diyism dot com 
In fact, i make the above request for the "SoWork PHP Framework":

<?
define('this', mt_rand());
class cls_so_work
      {function __call($fun, $pars)
                {foreach ($pars as &$v)
                         {if ($v===this)
                             {$v=$this->val;
                              break;
                             }
                         }
                 $tmp=eval('return defined("'.$fun.'")?constant("'.$fun.'"):"'.$fun.'";');
                 $this->val=call_user_func_array($tmp, $pars);
                 return $this;
                }
       function __toString()
                {return 'so_work';
                }
       function cls_so_work()
                {$obj=func_get_args();
                 $this->val=isset($obj[0])?$obj[0]:null;
                }
      }
function so_work()
         {$obj=func_get_args();
          if (isset($obj[0]))
             {return new cls_so_work($obj[0]);
             }
          else
              {if (!isset($GLOABALS['so_work']))
                  {$GLOABALS['so_work']=new cls_so_work();
                  }
               else
                   {$GLOABALS['so_work']->val=null;
                   }
               return $GLOABALS['so_work'];
              }
         }
$o=so_work();

define('echo', 'my_echo');
function my_echo($obj)
         {echo $obj;
          return $obj;
         }

//$o('abcd')->substr(this, 2, 2)->strlen(this)->echo(this);
$o->substr('abcd', 1, 3)->strlen(this)->echo(this);
?>

The commented line in the end will raise the error.
 [2009-11-02 08:57 UTC] kexianbin at diyism dot com 
Change expected version to 5.3.1 from 5.3.0
 [2009-11-02 11:36 UTC] colder@php.net 
If you want to handle what goes on when $o(); is used, see the 
__invoke() magic method
 
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