building a function with an optional argument

[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?

[Colin F]

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]

I don't understand your question?

[sabret00the]

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]

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]

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]

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