vb.org Archive - building a function with an optional argument

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- - building a function with an optional argument (https://vborg.vbsupport.ru/showthread.php?t=91622)

sabret00the

07-04-2005 07:03 PM

building a function with an optional argument

how would i go about doing the above

PHP Code:


		
			
function getpiece($id = FALSE)



    global $p;



    if (!$p)

    {

        $p = intval($id); // if $p exists $id won't exist

    }

how would i go about doing this?

Colin F

07-04-2005 07:13 PM

Quote:

Originally Posted by sabret00the

how would i go about doing the above

PHP Code:


		
			
function getpiece($id = FALSE)

    global $p;

    if (!$p)
    {
        $p = intval($id); // if $p exists $id won't exist
    }

how would i go about doing this?

if, in the functions arguments, you define something with a =, it'll use that value if nothing is entered.

so you can do this:

PHP Code:


		
			
function foo($firstvar)
{
}

this

PHP Code:


		
			
function foo($firstvar = 'standardvalue')
{
}

this

PHP Code:


		
			
function foo($firstvar = 'standardvalue', $secondvar = 'standardaswell')
{
}

this,

PHP Code:


		
			
function foo($firstvar, $secondvar = 'standard')
{
}

and so on.

Any arguments that are needed have to be at the beginning though.

Andreas

07-04-2005 07:14 PM

I don't understand your question?

sabret00the

07-04-2005 08:41 PM

basically i have the function getpiece

PHP Code:


		
			
function getpiece($id = 'nothere')

{

    global $vboptions, $stylevar, $vbphrase, $bgclass, $DB_site, $p;



    if ($id != "nothere")

    {

        $p = $id;

    }



    $getthepiece = $DB_site->query_first("

        ## query ##

    ");



return $getthepiece;

most of the times i call getpiece() via

PHP Code:


		
			
$array = getpiece(); // for this is uses the $p

but i need to call it in another function with

PHP Code:


		
			
$array = getpiece($pieceid); // because $p doesn't exist

Andreas

07-04-2005 08:51 PM

I still don't get what you want, but maybe it's this:

PHP Code:


		
			
function getpiece()

{

    global $vboptions, $stylevar, $vbphrase, $bgclass, $DB_site, $p;



    if (func_num_args() > 0)

    {

        // Called with Parameters, so we take the first parameter as $id

            $id = func_get_arg(0);

    }

    else

    {

        // Called with no Parameters, so we take $p as $id

        $id = $p;

    }



        $getthepiece = $DB_site->query_first("

Paul M

07-04-2005 08:53 PM

Difficult to answer without seeing the query - does it pull some data based on the value of $p ?

Why don't you just make the first one ;

$array = getpiece($p);

and then just make the function return the appropiate data from the query using $id.

sabret00the

07-11-2005 08:58 AM

thanks all for your help, in the end i got it to work using function($var) for both calls

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