How do i handle this dividing modulus error? - php

Question

I have a function that generates a category menu.
What i'm trying to do is to group two category in one ul.
The problem is almos fixed but i'm getting an empty ul ( see the pic).
How can I fix this ?
function categorie($tab){
global $mysql;
$return = "";
$categorie = $mysql->select(sprintf("SELECT * FROM categorii WHERE tab = '%d'", $tab));
if($mysql->countRows() > 0){
$i = 0;
$return .= "<ul class=\"group\">\n";
foreach ($categorie as $cat) {
if($i % 2 == 0){
$return .= "</ul><ul class=\"group\">";
}
$return .= "\t<li>\n";
$return .= "\t\t<ul>\n";
$return .= "\t\t\t<li class=\"head-list\">".$cat['categorie']."</li>\n";
$return .= $this->subcategorie($cat['categorie']);
$return .= "\t\t</ul>\n";
$return .= "\t</li>\n";
$i++;
}
$return .= "</ul>";
}
return $return;
}

Answer 1

Try this:
function categorie($tab){
global $mysql;
$return = "";
$categorie = $mysql->select(sprintf("SELECT * FROM categorii WHERE tab = '%d'", $tab));
if($mysql->countRows() > 0){
$i = 0;
$return .= "<ul class=\"group\">\n";
foreach ($categorie as $cat) {
if($i % 2 == 0 && !empty($i)){
$return .= "</ul><ul class=\"group\">";
}
$return .= "\t<li>\n";
$return .= "\t\t<ul>\n";
$return .= "\t\t\t<li class=\"head-list\">".$cat['categorie']."</li>\n";
$return .= $this->subcategorie($cat['categorie']);
$return .= "\t\t</ul>\n";
$return .= "\t</li>\n";
$i++;
}
$return .= "</ul>";
}
return $return;
}

Answer 2

just start counting from -1
$i = -1;