Spiegazioni Funzioni variablili

[lillop]

Salve, ho bisogno che qualche anima pia mi spieghi quest'esercizio.
Ok per la prima funzione che si richiama con apples()

<?php
$function_variable = "apples";
$function_variable();       
 
$function_variable = "oranges";
$function_variable("In oranges() now."); 
 
$function_variable = "bananas";
$function_variable("In bananas() now."); 
 
function apples()
   {
      echo "In apples() now.
";
      echo "We have plenty of apples.

";
   }
 
function oranges($argument)
   {
      echo "$argument 
";
      "We have plenty of oranges also.

";
   }
 
function bananas($argument="")
   {
      echo "$argument 
";
      echo "Well stocked on bananas too.

";
   }
?>

[filippo.toso]

http://www.php.net/manual/en/functio...-functions.php

PHP supports the concept of variable functions. This means that if a variable name has parentheses appended to it, PHP will look for a function with the same name as whatever the variable evaluates to, and will attempt to execute it.

In pratica $function_variable(); significa, esegui la funzione il cui nome e' contenuto nella variabile $function_variable.