php oop construct optional parameters syntax error

Question

I'm learning php oop, going through books etc and having a go at my own.

In my __construct I have a number of parameters that have default values (in fact all of them do). However when I try to write code to create a new object I'm having syntax error problems.

For example my construct statement has 6 parameters. I passed values to the first three, wanted to skip the next two and set a value for the last one. I simply put commas with nothing between them but it throws up a syntax error.

What should I put in place of nothing to accept the default value?

Thanks

Answer 1

Pass NULL instead of nothing

Example:

$obj = new Whatever($parm1,$parm2,$parm3,NULL,NULL,NULL); 

or in your constructor set the to null

__construct($parm1 = NULL,$parm2 = NULL,$parm3 = NULL,$parm4 = NULL,$parm5 = NULL,$parm6 = NULL)

And call it like this

 $obj = new Whatever();   

UPDATE from your comment:

Your code:

function __construct(
    $userid, 
    $magicCookie, 
    $accessLvl = 'public', 
    $det       = 'basic', 
    $sortOrder = 'starttime', 
    $recurring = 'true', 
    $d_from    = "01/01/2011", 
    $d_to      = "31/01/2011", 
    $max       = "10") {
    // Code goes here...
} 

So calling like this

// After the seconds parameter you have default values
$obj = new Whatever(
    $userid, 
    $magicCookie
    );  

What do you think about this?

function __construct(
    $userid, 
    $magicCookie, 
    $accessLvl = NULL, 
    $det       = NULL, 
    $sortOrder = NULL, 
    $recurring = FALSE, 
    $d_from    = NULL, 
    $d_to      = NULL, 
    $max       = NULL) {
    // Code goes here... Yes set Defaults if NULL
}

Call it like this:

$obj = new Whatever(
    $userid, 
    $magicCookie, 
    $accessLvl = 'public', 
    $det       = 'basic', 
    $sortOrder = 'starttime', 
    $recurring = TRUE, 
    $d_from    = "01/01/2011", 
    $d_to      = "31/01/2011", 
    $max       = 10);