Tengo esto en prueba
Código PHP:
Ver original$catsql=$mysqli->query("SELECT id,name FROM categories ORDER BY name ASC");
$defcatsql=$mysqli->query("SELECT category_id FROM category_user WHERE user_id='1' ORDER BY category_id ASC");
$defcatres=$defcatsql->fetch_array();
<select name="category[]" id="category" class="category-multiple" multiple="multiple">
<?php while($catres=$catsql->fetch_array()) {
foreach($defcatres as $defcatid) {
if($defcatid==$catres["id"]) {
print("<option value=\"".$catres["id"]."\" selected>".$catres["name"]."</option>");
}else{
print("<option value=\"".$catres["id"]."\">".$catres["name"]."</option>");
}
} } ?>
</select>