Allowing Optional 'Pass by Reference' parameters? 1

[OmniCog]

How can I make a parameter that is passed by reference optional?

IE)
function xyz ($param1, $param2, &$errors) {
...
}

so that something like:
xyz ($param1, $param2);
would still work and not require a '@' to supress warning messages.

 

[sleipnir214]

One way, not very elegant, is to define your function to accept pass-by-value inputs with default values, then pass the function a reference in the third parameter:

<?php

function foo ($x, $y, $z = '__DUMMY__VALUE__')
{
   if ($z != '__DUMMY__VALUE__')
   {
      $foo =& $z;
      $foo =  4;
   }
}

$a = 3;
foo(1, 2, &$a);
print $a;

?>

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TANSTAAFL!!

 

[OmniCog]

Works like a charm thanks!