I want to alternate between different operation modes without having
to introduce additional control structures into a piece of software.

This could be archieved by setting an optional parameter to a function
that does not affect the programs state. It should accept an arbitrary
number of mixed-type arguments while not causing significant overhead
at runtime. Then you would call the parameter each time the code runs.

Assuming debugging is what you want to be done, the use would be like

   function f ($arg, $mode = 'array') {

     function debug () { echo $arg };
     $mode ($arg);

     compute ();

array () suffices but introduces to overhead when large chunks of data
(e.g. pieces of code) are passed to it. Any suggestions on this?

  D. Alvarez Arribas <[EMAIL PROTECTED]>

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