function array_key_exists in an array that contain subb_arrays

I met some trouble with a function.

In fact I would like to include all my pages, but the thing is that not all pages are named like the param $_GET['page'] for example if I call index.php?p=accueil it will redirect to php/home.php

an other example if I call index.php?p=message it will redirect transparently to message.php

For all exceptions I've generated an array like that:

<?php    
$paramListepages = array(       
     'corbeille' => array(
         'libelle'     => 'corbeille',
         'page'        => 'php/trash.php'
     ),   
     'nouveaumessage' => array(
         'libelle'     => 'nouveaumessage',
         'page'        => 'php/envoyer.php'
     )  
);
?>

This array contain many sub_arrays As you can see the 2 firsts of this one.

For calling pages I've done a function like that:

function getPage($var) {
    if (!isset($var)){
        //Aucune page spécifiée => default page
        inlude('php/accueil.php');
    }
    elseif (array_key_exists($var,$paramListepages)){
        // page trouvée => on l'inclut!
        include ('php/accueil.php');
    }
    else{
        // page espectant la structure, non trouvée dans l'array => on l'inclut directement
        include('php/'.$var.'.php');    
    }
}

actualy it seems to recognise the if condition and the else.

But when I ask for a page in the array, there is a blank page It seems to not be able to read the correct value expected.

I have white empty pages with no mistake or message error.

In my Ubuntu I've activated the error_reporting(E_ALL);

Any kind of help will be much appreciated