[PHP] Variable functions within an object

[Julio Sergio Santana]

I need to record the names of functions, and then use them later.
Recently I found the following example within the on-line documentation:
<?php
function foo() {
   echo "In foo()<br />\n";
}
$func = 'foo';
$func();        // This calls foo()
?>
then I supposed that it was easy to extend this concept to objects and 
wrote the following case:

<?php
function foo() {
   echo "In foo()<br />\n";
}
class a {
  var $fname;
  function a() {
    $this->fname = 'foo'; // the name of the function
  }
  function execute() { // method to execute the named function
    $this->fname();
    // I also tried here
    // {$this->fname}();
    // ${this->fname}();
    // "$this->fname"();
    // but none of these worked
  }
}
$w = new a;
$w->execute();
?>
And this was the error I got:
X-Powered-By: PHP/4.1.2
Content-type: text/html
<br>
<b>Fatal error</b>:  Call to undefined function:  fname() in <b>-</b> on 
line <b>14</b><br>

I know that this can be solved easily with an intermediate variable:
$temp = $this->fname;
$temp();
but I wonder if there is a more direct method.
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