¿Como saber si tengo parametros o no en la URL?

[almagropaco_]

Código PHP:

<?php if(isset($_GET[cat])){ //Condicional si es que esta definida la variable cat
 
if($_GET["cat"] == "Amistad"){
$paging->agregarConsulta("Select * from visible where FK_CATEGORIA like 'Amist%' order by ID_POST_VISIBLE desc"); 
}
elseif($_GET["cat"] == "Amor"){
$paging->agregarConsulta("Select * from visible where FK_CATEGORIA like 'Amo%' order by ID_POST_VISIBLE desc");
} 
elseif($_GET["cat"] == "Dinero"){
$paging->agregarConsulta("Select * from visible where FK_CATEGORIA like 'Diner%' order by ID_POST_VISIBLE desc");
} 
 
}else{echo"No se definio la variable cat";}
?>