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I need to have a photo gallery that only displays one category at a time.

It must not display all categories if the specified category does not exist.
i.e. if category id 7 does not exist http://domain.com/index.php/gallery/category/C7 must display nothing rather than all categories.

It’s quite straightforward to make http://domain.com/index.php/gallery/category not display anything by checking if segment_3 exists. But what I’d like to know is how to force the photo gallery entries to only be those from categories=segment_3.

Anyone got a recommendation?

The only way I’ve got is to use some php to remove the “C” from the photo gallery category id in segment 3 using php.

<?php 
global $IN;
$seg3 = $IN->SEGS[3];
$s1=substr($seg3,0,1);
if ($s1=="C" || $s1=="c"){
    $cat_id=substr($seg3,1);
} else {
    $cat_id=$seg3;
}
?>
{exp:gallery:entries gallery="{gallery_name}"  category="<?php echo $cat_id; ?>" orderby="title" sort="asc" columns="4" rows="3"}

Any better ideas?