echo no value?

[user_scan]

I like to stop the html from printing if no value($num[0], $name[1]) exist.
here's my code:

foreach($categories as $name[1]=>$identity) {
$identity = trim($identity);
$name = explode("|", $identity);
$num = explode("|", $identity);
echo ("<a href=\"?cat=$num[0]\">$name[1]</a>&nbsp;");

Can anybody help?

[bpat1434]

foreach($categories as $name[1]=>$identity) {
    $identity = trim($identity);
    $name = explode("|", $identity);
    $num = explode("|", $identity);
    if($num[0] == '' || $name[1] == '' || empty($num[0]) || empty($name[1])){
        echo ("<a href=\"?cat=$num[0]\">$name[1]</a>&nbsp;");
    }
}