DaniWeb Forum Index > Web Development > PHP

optional variables in php functions

Please support our PHP advertiser: PostgreSQL or MySQL? Compare and contrast the two most popular open source databases

Thread Solved

•

Join Date: Feb 2008

Posts: 26

Reputation: isotope is an unknown quantity at this point

Solved Threads: 0

isotope

Offline

Light Poster

optional variables in php functions

Oct 30th, 2008

Hi everybody, there's a question I would ask about php functions.

I would like to know if it is possible to have optional variable in functions.
Let's say, for instance, that I have:

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
function my_fun($a,$b,$c){
     various stuff
}
function my_fun($a,$b,$c){
     various stuff
}

In some cases I would recall the function, inputting values for "a","b" and "c", while in some other cases I would just input values for "a" and "b".

In both cases the function is working, but when I input just two values I have the following error shown on the page, before the code is executed:
Warning: Missing argument 3 for my_fun(), called in...

Is there a way to say that $c is optional, in order to avoid the message to be displayed?

Thank you very much,
s

IT goes green
(sustainable informatic development)

•

Join Date: Jun 2007

Posts: 1,227

Reputation: kkeith29 has a spectacular aura about

Solved Threads: 167

kkeith29

Offline

Nearly a Posting Virtuoso

Re: optional variables in php functions

Oct 30th, 2008

to make it optional, you have to set the varible with a value in the function.

ex.

 Help with Code Tags 
 PHP Syntax (Toggle Plain Text) 
<?php
 
function test( $a,$b,$c='') {
//do what you need
}
 
?>
<?php

function test( $a,$b,$c='') {
//do what you need
}

?>