Optional arguments in functions

[trink]

In a function, how would I make a specific argument optional?

 

Say I had something like this:

function myfunction($a,$b,$c,$d){
if(!$d){
$d=1;
}
return $a.$b.$c.$d;
}

Thats basically what I'm trying to do with my function, and its not working.  It returns the correct value, but I have to supress the error that it returns about not having a 4th argument with a @.  So it ends up looking like @myfunction(1,2,3).  I don't mind using the @ but I'd like to make the fourth argument optional.

 

I'd appreciate any help on this topic.

[pocobueno1388]

You just have to assign the optional arguments a default value, that makes it optional.

 

<?php

function myfunction($a,$b,$c,$d=1){
   return $a.$b.$c.$d;
}

?>

 

So if you don't put anything for $d, it will automatically become "1" as default. If you don't want it to be anything, just put NULL in place of the 1.