Is there an elegant alternative in PHP for '#ifdef'

[samdorrell4]

I'd like to use Macros to control what functions/variables are used in order to test my PHP file. But I know PHP doesn't do Macros, so what would someone suggsest is an elegant way to do this? The reason for having the macros is so I can easily switch between one themeID and another while still having full control over each theme! Please ignore the fact that I've used some C constructs and others PHP!

For instance:

#define themeID1
#ifdef themeID1
#   define $BANNERNAME 'flowers.jpg'
#else
#   ifdef themeID2
#       define $BANNERNAME 'robots.jpg'
#   endif
#endif

// Now I'm going to add this banner to my wordpress 
// thematic theme!
function add_banner(){ 
    global $BANNERNAME;
    $styledir = get_styledir(); 
    echo '<img src="'.$styledir.'/'.$bannerName.'">';
}
add_action('thematic_header','add_banner',3);

[samdorrell4]

Ah, I think I made a mistake earlier, apparently I can just do this.

<?php
$themeId = 1;  
switch ($themeId){
    case (1):
        $bannerName = 'flowers.jpg';
        break;
    case (2):
        $bannerName = 'robots.jpg';
        break;
}

//my functions
...
...
?>

Is this a decent way to do things in PHP?