Probleme PHP\SQL Fontion SELECT FROM

$resultat = mysql_query ($requete); 

$resultat = mysql_query ($requete)or die("Error_req : ".mysql_error()); 

echo '<pre>';
     print_r($ligne);
echo '</pre>'

Array
(
    [cat,desc FROM table] => cat,desc FROM table
)

<?php


(INFO DE CONNEXION)


// connexion à MySQL
mysql_connect ($serveur,$login,$pwd) or die ('ERREUR '.mysql_error());	

// sélection de la base de données
mysql_select_db ($nom_base) or die ('ERREUR '.mysql_error()); 

// Requete
$requete = "SELECT 'cat,desc FROM table'";
$resultat = mysql_query ($requete)or die("Error_req : ".mysql_error()); 


$ligne = mysql_fetch_assoc($resultat);


echo '<pre>';
     print_r($ligne);
echo '</pre>'



?>

$requete = "SELECT 'cat,desc FROM table'";

$requete = "SELECT cat,desc FROM table";

Error_req : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'desc FROM table' at line 1

SELECT 'cat','desc'FROM table